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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

What practical applications does set theory have?

As a working mathematician, not as a logician what I am not, set theory is the set (!) of rules in order to use the symbol $\in$, meaning "belongs to". That tells me when and how I can use it. EDIT: …
Patrick I-Z's user avatar
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1 vote

What is the definition of "canonical"?

It is not an answer but it must have to do with the way our brain pick up a sample between a few ones. It must be the minimum of some function which can be implemented for real in the brain. I do not …
Patrick I-Z's user avatar
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7 votes

A book you would like to write

After reflexion, I think I will reduce my contribution to this: Don't think too much about the book you want to write, just write it down. Don't wait that everything is perfect, just begin. Anyway, it …
Patrick I-Z's user avatar
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3 votes

Theorems that are 'obvious' but hard to prove

In the same vein, chating: My advisor used to say "An interesting theorem is a theorem true which looks false". Well, tastes and colors... ;-)
Patrick I-Z's user avatar
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5 votes

What would you want to see at the Museum of Mathematics?

In such a museum, I would like to see how mathematics are used in real life, not just for their internal beauty (well, beauty, simplicity and usability are certainly related). I mentioned above in a c …
Patrick I-Z's user avatar
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