Math fun -> 1 = 2

[bchip]

Let a = b

a^2 = ab (multiply by a)
a^2 - b^2 = ab - b^2 (minus b^2)
(a+b)(a-b) = b(a-b)
a+b = b (divide by a-b)
b + b = b (as a =b)
2b = b
2 = 1

 

[cguy]

Let a = b

a^2 = ab (multiply by a)
a^2 - b^2 = ab - b^2 (minus b^2)
(a+b)(a-b) = b(a-b)
a+b = b (divide by a-b)
b + b = b (as a =b)
2b = b
2 = 1

On the 4th line you divide by 0.

So this ultimately becomes the same as saying since 1xinf = 2xinf, 1=2. Infinity is not part of the field.

Is fun though

 

[TheMightyQuin]

 

[Nqindi]

 

[cr@zydude]

On the 4th line you divide by 0.

So this ultimately becomes the same as saying since 1xinf = 2xinf, 1=2. Infinity is not part of the field.

Is fun though

Yip, this is a pretty well known example.

 

[MirageF1]

High school concept, division by zero - undefined op.