1 - 1 + 1 - 1 + 1 ... = ?

The best answer might surprise you.
gorillamansays...

It surprises me that mathematicians don't know logic.

If you alternate two of anything to infinity then you must have an even number of each. +1-1... = (1-1)infinity = 0

Maths troll successful I guess, but I don't see that this can possibly be wrong.

rancorsays...

Actually, you're the one making an unwarranted logical leap by assuming you can apply standard arithmetic logic to an infinite series. In the vid, it's done to explore the issue but it does not qualify as mathematical proof.

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