# Prove: 1 + 1 = 2

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#1
Prove:

1 + 1 = 2
0
15 years ago
#2
I don't feel like it  0
15 years ago
#3
(Original post by integral_neo)
Prove:

1 + 1 = 2
(Original post by integral_neo)

1 + 1 = 2
Proved.
0
15 years ago
#4
(Original post by Pencil)
Proved.
Well done. 0
15 years ago
#5
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15 years ago
#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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15 years ago
#7
(Original post by 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???
I thought you used Peano's axioms.
0
15 years ago
#8
(Original post by Squishy)
I thought you used Peano's axioms.
Mine was a plain guess
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15 years ago
#9
My maths teacher had to do this at the beginning of her degree..
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#10
(Original post by imasillynarb)
My maths teacher had to do this at the beginning of her degree..
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
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15 years ago
#11
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)
0
15 years ago
#12
(Original post by 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
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!
0
15 years ago
#13
(Original post by 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)
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.
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#14
(Original post by 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? 0
#15
(Original post by 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
0
#16
(Original post by 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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15 years ago
#17
you cant prove an axiom!
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#18
(Original post by Willa)
you cant prove an axiom!
i have seen the proof for this in the principia by Newton, so yes u can and im sure an easier version of the proof exist
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15 years ago
#19
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#20
(Original post by JamesF)
Click

cheers 0
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