# Prove 1+1=2

• Feb 25th 2010, 11:53 AM
Mukilab
Prove 1+1=2
How to prove (not show) that 1+1=2
• Feb 25th 2010, 11:59 AM
Quacky
I'm not sure I understand. There is not a proof needed. Is that not almost the very definition of two?
• Feb 25th 2010, 12:14 PM
nikhil
my thinking
I guess 1+1=2 is a convention.
if a single entity is called 1 (conventionally) then its double will be called 2(conventionally). since two quantities are individually single therfor 1+1=2 must hold. [for this operation of addition is also defined conventionally.]
this question is similar to the question why B comes after A.(even it is a convention)
• Feb 25th 2010, 01:17 PM
Mukilab
Quote:

Originally Posted by nikhil
I guess 1+1=2 is a convention.
if a single entity is called 1 (conventionally) then its double will be called 2(conventionally). since two quantities are individually single therfor 1+1=2 must hold. [for this operation of addition is also defined conventionally.]
this question is similar to the question why B comes after A.(even it is a convention)

Quote:

Originally Posted by Quacky
I'm not sure I understand. There is not a proof needed. Is that not almost the very definition of two?

not what I was looking for. Will wait for further answers.
• Feb 25th 2010, 01:53 PM