Why is 1+1=2? I know there's a whole book dedicated to why 1+1=2, does anybody know the author?
357221
You are thinking of the book 'Principia Mathematica' by (Bertrand) Russell and Whitehead, written in 1913. The book was actually dedicated to putting mathematics on a logical foundation. It uses rather antiquated notation and really didn't accomplish what it intended to do, but it was a massive effort. The statement that 1+1=2 came in the middle of the second volume of the three volume set. There is a paperback version for about the first half of the first volume that is still available.
560328
anything to the power of zero is one. so 1+1=2. Y=2. 2X2=4.
823906
not quite sure what exactly you mean, but i would guess\n\n2+2+2+2 or 4+4 or 1+1+1+1+1+1+1+1
749939
Nobody can help you because it's false.\n\nLet a1 = 1, a2 = 4, b1 = 2, b2 = 3, and n = 7\nThen a1 + a2 = 5, b1 + b2 = 5\nBut a1*a2 = 4, while b1*b2 = 6.\n\nYou are talking about modular arithmetic, right?
1153023
It is really surprising that there are still people who think they have a PROOF for statements like 1=2, 1=0, etc.\nFirst they should UNDERSTAND what is a PROOF.\n\nPROOF is a sequence of logically correct steps. If ONE of your step is wrong then it is NOT called a proof.\n\nI think these people should go back to Primary schools and LEARN the fundamentals.
655260
2=-1=x\n2+1=x\nthere fore x =3
924405
Is it possible to have 2 equal signs in a problem?\nI am only in algebra but I haven't seen one like that before.\nSorry I couldn't help.
574042
we need to multiply something by (x+1) so that the result would be x^2-1. but we know x^2-1 = (x-1)(x+1).\nso we have to multiply (x-1) with (x+1) to get x^2-1.
509288
if a=b+c then there exists an integer q and another integer r s.t. a=bq+r  q=1 r not = 0 => a and b do not share a common factor.  furhermore this line of reasoning seems to have little to do with fermat's last th.
166763
1+1=2 is an axiom - something that we consider being true without proving it.
287019
1 + 1 = 2\none plus one = oneone
307282
that math formula that proves it is SO WRONG! i just talked about this with someone, if you look at the formula it gets messed up like halfway through.\n\ndo we need to break this down?\none fish + one fish = 2 fish
556722
look at my question\n\nBidDogARRRRR...\n1 minute ago\nDoes anyone know 0=1 and anything = anything else?\na = 1; b = 0\n1. a = b + 1 \n2. (a-b)a = (a-b)(b+1)\n3. a2 - ab = ab + a - b2 - b \n4. a2 - ab -a = ab + a -a - b2 - b\n5. a(a - b - 1) = b(a - b - 1) \n6. a = b\n7. b + 1 = b \n8. Therefore, 1 = 0
200519
+/- 1\n\nThe answer is not 1, because -1 * -1 = 1 also.
1185918
a/a = 1 (axiom: any thing except zero divided by the same yields 1 all the time)\n\nso, a/a = 1\nnow multiplying everyside by (a/1) we get,\n\na/a * (a/1) = 1* (a/1)\n\nor a^2/a = a/1\n\nor a = a/1  (axiom: anything except zero multiplied by 1 yields the same number)\n\nso it is proved that a = a/1
630600
because (x+a)^2 = x^2 + 2ax + a^2\n\nthat's simple algebraic binomial expansion.
1010309
Let a = b = 1.\n\na = b     [Given]\na ^2 = ab     [Multiplying a on both sides]\na^2 - b^2 = ab - b^2     [Subtracting b^2 on both sides]\n(a + b)(a - b) = b(a - b)     [Factoring both sides]\n(a + b) = b     [Dividing both sides by (a - b)]\n(1 + 1) = 1     [Substitution]\n2 = 1\n\nThe flaw in this so-called "proof" is that you can't divide both sides of an equation by (a - b), because with a = b, a - b = 0, and you can't divide a number by zero.