# Prove: 1 + 1 = 2

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#3

(Original post by

**integral_neo**)

1 + 1 = 2__Prove:__1 + 1 = 2

(Original post by

**integral_neo**)

1 + 1 = 21 + 1 = 2

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#6

Doesnt it go back to euclidian rules of geometry, ie a thing of length one unit + a thing of length one unit = a thing of length 2 units, am i right???

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#7

(Original post by

Doesnt it go back to euclidian rules of geometry, ie a thing of length one unit + a thing of length one unit = a thing of length 2 units, am i right???

**cobra01977**)Doesnt it go back to euclidian rules of geometry, ie a thing of length one unit + a thing of length one unit = a thing of length 2 units, am i right???

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(Original post by

My maths teacher had to do this at the beginning of her degree..

**imasillynarb**)My maths teacher had to do this at the beginning of her degree..

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#11

I did this in yr 10

let a = b

a² = ab

a² + a² - 2ab = ab + a² - 2ab

2(a² - ab) = a² - ab

2 = 1

let a = b

a² = ab

**Multiply both sides by a**a² + a² - 2ab = ab + a² - 2ab

**Add (a² - 2ab) to both sides**2(a² - ab) = a² - ab

**Factor the left, and collect like terms on the right**2 = 1

**Divide both sides by (a² - ab)**
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#12

(Original post by

i know the proof is quite complex but I saw the newton proof for this but didnt understand it so i thought someone may know a method which i could understand

**integral_neo**)i know the proof is quite complex but I saw the newton proof for this but didnt understand it so i thought someone may know a method which i could understand

therefore, divide the whole lot by 2

1 + 1 = 2

Ruthie xx

i think i deserve a prize!

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#13

(Original post by

I did this in yr 10

let a = b

a² = ab

a² + a² - 2ab = ab + a² - 2ab

2(a² - ab) = a² - ab

2 = 1

**Widowmaker**)I did this in yr 10

let a = b

a² = ab

**Multiply both sides by a**a² + a² - 2ab = ab + a² - 2ab

**Add (a² - 2ab) to both sides**2(a² - ab) = a² - ab

**Factor the left, and collect like terms on the right**2 = 1

**Divide both sides by (a² - ab)**I don't think you need to prove it, it's just definition.

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**Widowmaker**)

I did this in yr 10

let a = b

a² = ab

**Multiply both sides by a**

a² + a² - 2ab = ab + a² - 2ab

**Add (a² - 2ab) to both sides**

2(a² - ab) = a² - ab

**Factor the left, and collect like terms on the right**

2 = 1

**Divide both sides by (a² - ab)**

2 = 1

who asked u to prove 2 = 1?

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(Original post by

2 + 2 = 4 we know this to be true

therefore, divide the whole lot by 2

1 + 1 = 2

Ruthie xx

i think i deserve a prize!

**ruthiepoothie**)2 + 2 = 4 we know this to be true

therefore, divide the whole lot by 2

1 + 1 = 2

Ruthie xx

i think i deserve a prize!

not correct

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(Original post by

That wasn't the proof he wanted. He wanted 1 + 1 = 2, not 1 = 2.

I don't think you need to prove it, it's just definition.

**Nylex**)That wasn't the proof he wanted. He wanted 1 + 1 = 2, not 1 = 2.

I don't think you need to prove it, it's just definition.

Proof does exist... and there are many versions of it

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(Original post by

you cant prove an axiom!

**Willa**)you cant prove an axiom!

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