How an you prove that 1+1=2?

Question

How can you prove this? I know that there is some mathemtical proof.

Answer 1

Here's one:

http://mathforum.org/library/drmath/view/51551.html

Answer 2

This is similar to a question I answered last week, show 2 != 3. Copied from there (http://answers.yahoo.com/question/index;_ylt=Ah6wyriBej34IWuEZSPIimvsy6IX?qid=20061210235023AAYCmbO&show=7#profile-info-9b34dc2a4d2f36fac67bb8f5fc593d48aa)


This is the wall that math hit in the early 1900s. You can't do proofs like this without rigorous definitions - a proof puts together what you "know" to show something follows from it. What do you know? These are the axioms you are using.

Very briefly, a typical exposition of integers starts with 0, the additive identity, and a successor function s(x). where s(x) >= x and x !>= s(x). 2 numbers a and b are described as equal if a >= b and b >= a. The positive integers are defined as 0, s(0), s(s(0)), s(s(s(0)))...

With these definitions you can then easily show that since 3 = s(2) then 3 >= 2 and 2 !>= 3, so 2 does not equal 3.

Answer 3

2-1=1 so 1 + 1=2

Answer 4

1 is the number that was chosen to designate a single unit. In mathematics it has come to pass through years of research that 2 units can be comprised of 2 single units put together.

It is like holding up one finger and then holding up the finger next to it. After much trial and error you can come to the conclusion that after you count one finger as one the other can then be counted as number 2.

Also in taking a number 2 you are pooping (1) and peeing (1). If you add those together you are taking a number 2. 1+1=2 is now proven.

Answer 5

LOL, funny guy. 1+1=2 is one of the most important problems in mathematical history. Leave it to greatest mathematicians. Why bother waste ur time on it? You can prove it by counting peanuts*wink*

Answer 6

Try this

http://mathforum.org/library/drmath/view/51551.html

edit:

Oh well, same link as Jim Burnell

Answer 7

do it with tangible objects.
Hold one candle in one hand, another single candle in the other hand (one and one) then put them side by side on a table. How many candles?