### 1 = √[1] = √[(-1) * (-1)] = √[-1] * √[-1] = i * i = iČ = -1. Thus, 1 = -1. QED

First Riot Post

xzarion

Senior Member

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Griftrix

Senior Animation Engineer

http://www.regentsprep.org/Regents/m...cyresource.htm

Spoiler alert, this points out the fallacy in the "proof".

QED.

Tejesh

Senior Member

Quote:
Oh you.

.999999999999 repeating is or is not 1?

Gespens

Senior Member

Well, he is not exactly wrong, just technically.

Griftrix

Senior Animation Engineer

Quote:
Originally Posted by Tejesh
Oh you.

.999999999999 repeating is or is not 1?
It is. But you will only understand that if you understand that 0.9 repeating is a real number, not something that approaches a number. Without that understanding it may be hard to grasp.

Griftrix

Senior Animation Engineer

Quote:
Originally Posted by Gespens
Well, he is not exactly wrong, just technically.
In mathematics, isn't technically wrong, exactly wrong?

Blugyblug

Senior Member

Quote:
Originally Posted by Griftrix
It is. But you will only understand that if you understand that 0.9 repeating is a real number, not something that approaches a number. Without that understanding it may be hard to grasp.
P(cp, c/p) lies on the rectangular hyperbola xy=c^2. Lines drawn from the foci S and S' are perpendicular to tangent at P, and meet the hyperbola at A, B, C, D.

find the coordinates of point A.

XAlFias

Senior Member

Go away math !!! Stop following meeeeeeeeeeeeee !!!!!!!!!!!!!

Bernkastar

Senior Member

Quote:
Originally Posted by Gespens
Well, he is not exactly wrong, just technically.
No; he is exactly wrong. The square root of 1 has 2 solutions: -1 and 1. By ignoring -1, which is the solution he's supposed to use, all the equations he made after are false.