Mathematic Illogic?

From https://plus.google.com/u/0/+GeoffreyNevine/posts/eYYiBWcvgiB

Here is another
a = b
→ a² = ab
→ a² - b² = ab-b²
→(a-b)(a+b) = b(a-b)
→ a+b = b
→ b+b = b
→ 2b = b
→ 2 = 1

and here... http://mathforum.org/dr.math/faq/faq.false.proof.html