can u prove 1+1=2?

Answer 1

1+1=x (say u dunno its2)
1=1/2
so 1/2+1/2+1/2+1/2= 4/2
which is 2
therefore 1+1=2

Answer 2

The proof starts from the Peano Postulates, which define the natural
numbers N. N is the smallest set satisfying these postulates:

P1. 1 is in N.
P2. If x is in N, then its "successor" x' is in N.
P3. There is no x such that x' = 1.
P4. If x isn't 1, then there is a y in N such that y' = x.
P5. If S is a subset of N, 1 is in S, and the implication
(x in S => x' in S) holds, then S = N.

Then you have to define addition recursively:
Def: Let a and b be in N. If b = 1, then define a + b = a'
(using P1 and P2). If b isn't 1, then let c' = b, with c in N
(using P4), and define a + b = (a + c)'.

Then you have to define 2:
Def: 2 = 1'

2 is in N by P1, P2, and the definition of 2.

Theorem: 1 + 1 = 2

Proof: Use the first part of the definition of + with a = b = 1.
Then 1 + 1 = 1' = 2 Q.E.D.

Note: There is an alternate formulation of the Peano Postulates which
replaces 1 with 0 in P1, P3, P4, and P5. Then you have to change the
definition of addition to this:
Def: Let a and b be in N. If b = 0, then define a + b = a.
If b isn't 0, then let c' = b, with c in N, and define
a + b = (a + c)'.

You also have to define 1 = 0', and 2 = 1'. Then the proof of the
Theorem above is a little different:

Proof: Use the second part of the definition of + first:
1 + 1 = (1 + 0)'
Now use the first part of the definition of + on the sum in
parentheses: 1 + 1 = (1)' = 1' = 2 Q.E.D.

Answer 3

a + a = 2a
so let a = 1
then 1 + 1 = 2*1
1+ 1 = 2 QED

Answer 4

can you prove 1+1 doesnt equal 2?

Answer 5

2-1 = 1 therefore 1+1=2
it is a theorem

Answer 6

For a strict mathematical proof you need to take a college course in Elementary Analysis, really. After 1 semester you've proven addition works. You have to show addition on integers is a Division Ring.

(that's all I remember, I took that course in 1971)

Answer 7

see your hands one on the left one on the right then count 1,,,2
then 1+1=2

Answer 8

One dollar plus one dollar equals 2 dollars. That's all the proof I need.

Answer 9

yes
1+1=2 see if you take 1 finger and you take a nother finger and you add them together then yuo get 2
yay doesnt math suck??

Answer 10

No, but it help people to get things done. Just like English and German Etc. it was invented to get things done

Answer 11

thats wrong
1+1=(2 me you are stupid)