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new forum - impossible math

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I know of at least 25 proofs to impossible things in math like 0=1; ln(-1) = ln(1) and such. It would be nice to have a forum for that topic.

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"New Puzzles" forum should be sufficient for that ... however, if you get it over 30 I will create a forum for you

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Out of the so-called proofs, are there any without a disguised division by 0? I've never seen one. All of these mathematical fallacies that I've seen have disguised division by 0.

For example:

Somewhere it says x=y and somwhere else it cancels out like this:

...

(x-y)ab = g(x-y)

ab = g

...

And you'd think nothing wrong happened but you've divided by 0 disguised as x-y as x = y.

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