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Questions designed to generate a "big list" of certain results, examples, conjectures, etc. via many individual answers, each contributing one or a few instances. Such a question should typically be in Community Wiki mode (CW); after asking, please, flag for moderators attention requesting the question to be made CW.

2 votes

Examples of common false beliefs in mathematics

“A reversible computer can factor integers efficiently in polynomial-time”: Since a reversible computer can multiply two integers efficiently in polynomial-time, it can also factor an integer efficien …
3 votes

Magic trick based on deep mathematics

Destination Unknown is a magic trick that makes use of Combinatorics. It really fools people. See http://themagicwarehouse.com/cgi-bin/findit.pl?x_item=SP2453&keyword=DESTINATION
75 votes
1 answer
12k views

What if the Riemann Hypothesis were false?

There are lots of known and interesting consequences of the Riemann Hypothesis being true. Are there any known and interesting consequences of the Riemann Hypothesis being false?