Physicist: In this case there’s no proof. With the exception of 0 and 1, all numbers are defined in terms of simpler numbers. “4” is Defined as “1+1+1+1”. And “2”is Defined as “1+1”.
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Recent
 Q: Is there anything unique about our solar system?
 Q: What is dark energy?
 Q: What are “actual pictures” of atoms actually pictures of?
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 0.999… revisited
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 The nuptial effect
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 Basic math with infinity
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 Learning intro number theory
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 Q: Is darkness a wave the way light is a wave? What is the speed of dark?
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 Q: What is quantum teleportation? Why can’t we use it to communicate faster than light?
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 My bad: If fusion in the Sun suddenly stopped, what would happen?
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 Q: Is there a number set that is “above” complex numbers?
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 Q: How does instantaneous communication violate causality?
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 Q: How would the universe be different if π = 3?
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 Q: Do colors exist?
 Q: How can we see the early universe and the Big Bang? Shouldn’t the light have already passed us?
 Q: Are beautiful, elegant or simple equations more likely to be true?
 Q: If quantum mechanics says everything is random, then how can it also be the most accurate theory ever?
 Q: Why do wet stones look darker, more colorful, and polished?
 Q: What would the universe be like with additional temporal dimensions?
 The 2012 Venus transit
 Q: Why haven’t we discovered Earthlike planets yet?
 Q: Is quantum randomness ever large enough to be noticed?
 Q: How is radiometric dating reliable? Why is it that one random thing is unpredictable, but many random things together are predictable?
 Q: Is the final step in evolution an ascension into an energybased lifeform?
 Q: What would life be like in higher dimensions?
 Q: How much does fire weigh?
 Q: Since the realworld does all kinds of crazy calculations in no time, can we use physics to calculate stuff?
 Q: Is there some way to actually play quidditch?
 Q: Can you poke something that’s far away with a stick faster than it would take light to get there?
 Q: Does how you deal cards affect how random they are?
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 Q: Is the quantum zeno effect a real thing?
 π day!
 Q: Is there an intuitive proof for the chain rule?
 Q: How do you write algorithms to enycrypt things?
 Q: Satellites experience less time because they’re moving fast, but more time because they’re so high. Is there an orbit where the effects cancel out? Is that useful?
 Q: Is it possible to objectively quantify the amount of information a sentence contains?
 Q: What would happen if a black hole passed through our solar system?
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 Q: Would it be possible in the distant future to directly convert matter into energy?
 Q: What’s the difference between antimatter and negativematter?
 Q: Why does gravity make some things orbit and some things fall?
 Q: Do you need faith to believe in science?
 Q: What keeps spinning tops upright?
 Q: Do time and distance exist in a completely empty universe?
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 Q: How does quantum physics affect electron configurations and spectral lines?
 Q: Is it possible for an atomic orbital to exist beyond the s, p, f and d orbitals they taught about in school? Like could there be a (other letter) orbital beyond that?
 Q: Will the world end in 2012?
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 Q: What are chaos and chaos theory? How can you talk about chaos?
 Q: What is the Riemann Hypothesis? Why is it so important?
 Q: Why does the entropy of universe always increase, and what is the heat death of the universe?
 Q: Could God have existed forever? Is it actually feasibly possibly for some ‘being’ to have just existed, infinitely?
 Q: How can wormholes be used for time travel?
 Q: If gravity suddenly increased would airplanes fall out of the sky, or would it compress the air in such a way that airplanes could keep flying?
 Entanglement omnibus!
 Q: How are imaginary exponents defined?
 Q: Why do nuclear weapons cause EMPs (electromagnetic pulses)?
 Q: How does the expansion of space affect the things that inhabit that space? Are atoms, people, stars, and everything else getting bigger too?
 Q: What would Earth be like if it didn’t turn?
 Q: According to the Many Worlds Interpretation, every event creates new universes. Where does the energy and matter for the new universes come from?
 Q: Can wind chill make things “feel” colder than absolute zero?
 Q: What is “spin” in particle physics? Why is it different from just ordinary rotation?
 Q: What is Bayes’ rule and how do I use it to improve my life?
 Q: Are there universal truths?
 Q: What’s the difference between black holes and worm holes? Could black holes take you to other universes?
 Q: Is there an equation that determines whether a question gets answered on ask a mathematician/physicist?
 Q: If you could hear through space as though it were filled with air, what would you hear?
 Q: What is the three body problem?
 Q: How are fractals made?
 Q: CERN’s faster than light neutrino thing: WTF?
 Q: What’s the point of purely theoretical research?
 Q: Why does lightning flash, but thunder rolls?
 Q: Hyperspace, warp drives, and faster than light travel: why not?
 Burning Man 2011
 Q: If light slows down in different materials, then how can it be a universal speed?
 Q: What is mass?
 Q: How much of physics can be deduced from previous equations/axioms?
 Q: If God were allseeing and allknowing, the doubleslit experiment wouldn’t work, would it? Wouldn’t God’s observation of the location of the photon collapse its probability wave function?
 Q: How do those “executive ball clicker” things work?
 Q: Why is cold fusion so difficult?
 Q: Why does light choose the “path of least time”?
 Q: Does light experience time?
 Q: Would it be possible for humans to terraform mars?
 Q: Can light be used to transfer energy instead of power lines?
 Particle physics, neutrinos, and chirality too!
 Q: What are integral transforms and how do they work?
 Q: How does reflection work?
 Q: What does a measurement in quantum mechanics do?
 Q: If you stood in the beam of a particle accelerator, what would happen?
 Q: What exactly is the vacuum catastrophe and what effects does this have upon our understanding of the universe?
 Q: What is a “measurement” in quantum mechanics?
 Q: How close is Jupiter to being a star? What would happen to us if it were?
 Q: Can you fix the “1/0 problem” by defining 1/0 as a new number?
 Q: How can we have any idea what a 4D hypercube or any nD object “looks like”? What is the process of developing a picture of a higher dimensional object?
 Q: Is it possible to destroy a black hole?
 Q: Why does the Earth orbit the Sun?
 Q: If you suddenly replaced all the water drops in a rainbow with samesized spheres of polished diamond, what would happen to the rainbow? How do you calculate the size of a rainbow?
 Q: If we meet aliens, will they have the same math and physics that we do?
 Q: Is 0.9999… repeating really equal to 1?
 Q: What would Earth be like to us if it were a cube instead of spherical? Is this even possible?
 Q: How do velocities add? If I’m riding a beam of light and I throw a ball, why doesn’t the ball go faster than light?
 Q: What is the universe expanding into? What’s outside the universe?
 Cheap experiments and demonstrations for kids.
 Q: How do I estimate the probability that God exists?
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 Q: Is there a single equation that proves black holes are real?
 Q: Is the edge of a circle with an infinite radius curved or straight?
 Q: As a consequence of relativity, objects becomes more massive when they’re moving fast. What is it about matter that causes that to happen?
 Q: What is the evidence for the Big Bang?
 Q: Is there a formula to find the Nth term in the Fibonacci sequence?
 Q: Why is the integral/antiderivative the area under a function?
 Thank you!
 Mathematical proof of the existence of God.
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 Q: What is going on in a nuclear reactor, and what happens during a meltdown?
 Q: How do I find the love of my life? (a Mathematician’s perspective)
 Q: Are all atoms radioactive?
 Q: How do you talk about the size of infinity? How can one infinity be bigger than another?
 Q: Why does E=MC^{2} ?
 Q: What are the equations of electromagnetism? What all do they describe to us?
 Q: What is the entropy of nothing?
 Q: How can quantum computers break encryption?
 Q: How does quantum computing work?
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 My bad: If atoms are mostly made up of empty space, why do things feel solid?
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 Q: Why does relativistic length contraction (Lorentz contraction) happen?
 Q: Why does Lorentz contraction only act in the direction of motion?
 Q: If atoms are mostly made up of empty space, why do things feel solid?
 Q: Can we build a planet?
 Q: π = 4?
 Q: How does a scientist turn ideas into math?
 Q: Is Santa real?
 Q: Why isn’t the shortest day of the year also the day with the earliest sunset?
 Q: Why does “curved spacetime” cause gravity?: A better answer.
 Q: According to relativity, two moving observers always see the other moving through time slower. Isn’t that a contradiction? Doesn’t one have to be faster?
 Q: What does 0^0 (zero raised to the zeroth power) equal? Why do mathematicians and high school teachers disagree?
 Q: Can you do the double slit experiment with a cat cannon?
 Q: How is the “Weak nuclear force” a force? What does it do?
 Q: Does Gödel’s Incompleteness Theorem imply that it’s impossible to be logical?
 Q: If accelerating charges radiate, and everything is full of charges, then why don’t I radiate every time I move?
 Q: If you zoom in far enough, what do particles look like?
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 Q: Why is pi not a definite number?
 Q: What came before the big bang?
 Q: How do “Numerology Math Tricks” work? (adding digits and tricks with nines)
 Q: What is a magnetic field?
 Q: What is the probability that two randomly chosen people will have been born on the same day?
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 Q: In the NEC “faster than light” experiment, did they really make something go faster than light?
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 Q: Does the 2nd law of thermodynamics imply that everything must eventually die, regardless of the ultimate fate of the universe?
 Q: What is The Golden Ratio? How is it used in Mathematics?
 Q: Why can’t you have an atom made entirely out of neutrons?
 Q: What is the physical meaning of “symmetries”? Why is there onetoone correspondence between laws of conservation and symmetries? Why is it important that there is such correspondence?
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 Q: How does the Twin Paradox work?
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 Q: Is it possible to beat the laws of physics?
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 Q: Aren’t physicists just doing experiments to confirm their theories? Couldn’t they “prove” anything they want?
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 Q: If you could see through the Earth, how big would Australia look from the other side?
 Q: How is it that Bell’s Theorem proves that there are no “hidden variables” in quantum mechanics? How do we know that God really does play dice with the universe?
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 Q: What would the consequenses for our universe be if the speed of light was only about one hundred miles per hour?
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 Video: How do we know that 1+1=2? A journey into the foundations of math.
 Q: Would it be possible to generate power from artificial lightning?
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 Q: What causes iron, nickel, and cobalt to be attracted to magnets, but not other metals?
 Q: Is it possible to fill a black hole? If you were to continuously throw galaxies worth of matter into a black hole, would it ever fill up? And what would theoretically happen if all the matter in the universe was thrown into a single black hole?
 Q: Can math and science make you better at gambling?
 Q: Spectroscopy?
 Q: Is it possible to breach the center of a nebula?
 Q: How does a gravitational sling shot actually speed things up?
 Q: If energy is quantized, what is the least amount of energy possible? And how did they measure it?
 Q: How did Lord Kelvin come up with the absolute temperature? I mean, how could he say surely that it was 273.15 C below zero?
 Q: What do complex numbers really mean or represent?
 Q: Is it odd that the universe’s constants are all so perfectly conducive to life?
 Q: How/when will the world end?
 Q: What would happen if an unstoppable force met with an unmovable, impenetrable object?
 My bad: Have aliens ever visited Earth?
 Q: How do Bell pairs (entangled particles) behave experimentally?
 Video: What your Spiritual Guru Never Told you about Quantum Mechanics
 Q: How big does an object have to be to gravitationally attract a Human or have a molten core?
 Video: The Scientific Investigation of Aliens – Evidence Examined
 Q: How do I count the number of ways of picking/choosing/taking k items from a list/group/set of n items when order does/doesn’t matter?
 Q: Who would win in a fight: Gödel or Feynman?
 Q: How hard would it be to make a list of products of primes that could beat public key encryption?
 Q: What are complex numbers used for?
 Q: Can one truly create something from nothing? If matter formed from energy (as in the Big Bang expansion), where did the energy come from?
 Q: Why does wind make you colder, but reentry makes you hotter?
 Q: Are explosions more or less powerful in space?
 Q: What is infinity? (A brief introduction to infinite sets, infinite limits, and infinite numbers)
 Q: Are there physical limits in the universe other than the speed of light?
 Q: Is it of any coincidence that mathematics is able to describe physical reality – given that both are inventions of the human mind?
 Q: If you were to break down an average human body into its individual atoms, and then laid the atoms out in a single straight line, how far would it stretch?
 Q: What’s it like when you travel at the speed of light?
 Q: Is there a real life example where two negatives make a positive?
 Q: Do the “laws” of physics and math exist? If so, where? Are they discovered or invented/created by humans?
 Q: Do we have free will?
 Q: How did mathematicians calculate trig functions and numbers like pi before calculators?
 Q: How can planes fly upsidedown?
 Q: A flurry of blackhole questions!
 Q: Why does going fast or being lower make time slow down?
 Q: What’s so special about the Gaussian distribution (i.e. the normal distribution / bell curve)??
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 Q: Is there a formula for how much water will splash, most importantly how high, and in what direction from the toilet bowl when you *ehem* take a dump in it ?
 Q: What is the meaning of the term “random”? Can thinking affect the future?
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 Q: Do aliens exist?
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 Q: Which is better: Math or Physics?
 Q: Why is the number 1 not considered a prime number?
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 Q: Why do superconductors have to be cold?
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 Q: How can we prove that 2+2 always equals 4?
What would happen if the Parallel Postulate became the Parallel Theorem? Would it only effect the scientific community in a hypothetical sense or would there be more drastic implications?
why we not multiply any trigonometry question by zero to solve it..
example prove 2+2 =4
o*(2+2) = 4 * 0
0 = 0
please answer ……….
Although you end up with a true statement (0=0), you don’t get any new information.
For example, if you were stuck with a question like “2x+1=5, what is x?”, you could multiply both sides by zero and get the (true) statement “0=0”, but you still wouldn’t know what x is.
X+X+X+X=(X+X)+(X+X)
4X=2X+2X ………sice; iknow mango=mango=2mango
or 4X=X(2+2)
devide this by X => 4=2+2
or 2+2=4
hence the proof.
sharafali.a, if you’re really intent on providing a proof, you could use the definitions directly instead of involving multiplication, division, distribution, and a variable. 4=1+1+1+1=(1+1)+(1+1)=2+2. Hardly deserves to be called a proof.
vishal, deriving a true fact from an initial statement does not prove the initial statement. This is backwards. I can use that type of argument to “prove” almost anything:
2+2 = 3
o*(2+2) = 3 * 0
0 = 0
In science, theories are often not proven, but disproven. Perhaps the same concept would have to be applied here. If the numbers 0 through 4 are set quantities (so that I can’t just turn around and say, oh let’s make 2=3 (artificially, as in a linguistic change, not a mathematical one)), then by definition a physical total of two 2s would yield four. It may be impossible to prove that 2+2 always yields four, but perhaps it is impossible to disprove 2+2 equalling four ever. Because the physical evidence is overwhelmingly in 2+2=4’s favor, perhaps it is a postulate or observing type of thing, like right angles are always equal, not a proof type of thing. However, applying the Peano axioms, there is a proof. There is one listed here: http://skepticsplay.blogspot.com/2008/12/224proof.html. Whether or not this actually proves 2+2=4 for every case is another matter.
Regardless, unless if you can find an instance where two physical twos never make a physical four (and I don’t mean taking two sets of two black holes and combining them together to see if you end up with four black holes or something to that effect, count before you combine them), 2+2=4.
I like pi(e).
How can we prove that 2+2 always equals 4? Dah, maybe check your report card to see if you graduated from 1ts grade and thus payed attention in school.
How can 2 people each with 2 apples share evenly if each one doesn’t end up with two apples each? Easily, make apple sauce. Thus proving anything can only be possible if we have no constraints.
My 2 cents:
You can prove 2+2=4 if you chose a right “formal system”, that is the right definitions, axioms and the “rules of proof”. And the 2+2 need not be 4… 😉 Consider:
a) you are doing modular arithmetics: each time you add two numbers, you take a reminder of the division by 4 as a result. Then,
2 + 2 = 0 (since the reminder of 4 divided by 4 is 0)
Most computers do binary arithmetics like this (just its not modulo 4, but modulo 2^32, or 2^64 nowadays…)
b) you are doing saturation arithmetics — you are only using 4 different numbers, 0, 1, 2, and 3, and whenever a result is larger than 3, it “sticks” to 3:
2 + 2 = 3
This kind of addition is useful in Xray detectors — when a detector is hit by such an intense Xray beam that the intensity exceeds the capacity of the detector, the detector “sticks” to its highest possible reading, and indicates an overflow (which is much better than wrapping back to 0; sure the highest reading is usually not 3 but something like 30 thousand or evem more 😉
3) if you are doing ternary logics where “0” is “false”, “1” is “unknown”, “2” is “true” and “+” is logical “or”, then
2 + 2 = 2
(since if two statements are true, then the statement “either of them or both of them are true” is also true).
d) 2 liters of ethanol + 2 liters of water, when mixed, will not give you 4 liters of solution — it will be slightly less…
e) and finally, when counting apples, sheep, you can reasonably expect that the “usual” school arithmetic
2 + 2 = 4
will apply well… 😉
So basically, what “2 + 2” amounts to depends on your set of axioms regarding “2”, “+” and “=”. From there on, you can derive a formal, “strict” proof; the reference to Peano arithmetic in a post before was a good demonstration!
Mathematitians are usually interested to derive (or prove) as many theorems as possible from the smallest amount of axioms. But what you prove dependes on what axioms you choose. Physicists are usually interested in mathematics that permits them the best description of the observed world. Which math (i.e. which set of axioms) you choose depends on what kind of phenomena you are invesigating…
Very nice explanation Saulius.
An even harder question: How do you know that 4=1+1+1+1? Why doesn’t 4=1+1? Why was the symbol “4” assigned to the value of 1+1+1+1?
@Vishal: that is a fallacy of identity. let’s say I change my name to Barack Obama, and it is known that Barack Obama is the name of the President of the United States. Am I then President?
two males in prison and two females in a separate female prison will remain four. a male and a female, two pairs, given the natural order of the world don’t remain only four for very long. life isn’t a series of statics 🙂
for the sake of traditional arithmetic proofs, you may need to look at numbers representing sets (church numbers for instance). since the rules of sets follow the rules of arithmetic (mostly) when dealing with countables, arguably you could use sets to prove arithmetic.
according to me it is easy to prove that 2 2=4.If we draw four lines in a plane we can easily see these lines.Now cover two lines by your hand and see two lines.These are two.Now remove your hand and cover last two lines these are also two.Now remove your hand and you can see all four lines.Thus it is proved that 2 2=4.
4=1+1+1+1 and 2=1+1, so 4=(1+1)+(1+1)=2+2 by definition. No need to prove it. 2+2 will not be 4 only if we change the definition for the numbers 2 or 4.
I was playing around with a mathematical system as follows.
0,1 ,+ where a+b=b+a i.e. + is commutative however NOT associative
define successor S(n)=n+1=1+n 2=S(1) 3=S(2) 4=S(3) etc.
so that 2=1+1 3=2+1 4=3+1 (=1+3 also)
furthermore 0 is the “additive identity” so a+0=0+a =a
now 2+2 =(1+1)+(1+1) will be distinct from 4 =(1+1+1)+1 =1+(1+1+1)
Remember + is non associative here.
also 2+3=3+2 will NOT be 5=4+1=1+4
these objects resemble “ordinary numbers but are formally distinct.
This is why I love math. It lets you posit 2+2≠4 counterintuitively.
According to the rules established by us itself, we have got 2+2=4. then how can we go on arguing whether 2+2 actually equals 4 or not????
what ? you prove it by subistuting the word red with the understanding red + red = 4 or 1 red 3 4 5 6
green blue and 2 are now prime colors
10days+4days = 2weeks
How prove 2=4
I think you can’t prove elementar things. Like “what’s mass?”, “what’s force?”, “what’s space?”. You can’t answer elementary questions like these. Because it goes so farther in the elementary state of number/things that we can’t even see “more than the amplified truth” like when we solve y=2x+1 when x=1. We just replace x by 1 and let the arithmetic (as we learnt) “amplify” the truth for us. But I think we can’t “amplify” more than this.
the question is is 2+2 always = 4.
and you have written that 0.99….. = 1
thus substituing 2 x 0.99… x2
= 4 x0.99999……
=3.999999999999…..(upto infinity)……….6
Now you habe to prove that above no. is equal to 1.
OR
like that:————–
9x 1/9 x4
=36 X 1/9
=4
Now 3.9999999999999999….(upto infnity)…6 = 4
Or theanswer is 3.9999……