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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.

6 votes

Why is a topology made up of 'open' sets?

I want to complete something said by Andrew Stacey above: like him I think that the only reason to motivate the use of the open sets it's because they are more easy to use. Topology is the study of pr …
0 votes

Canonical examples of algebraic structures

I think you'll find out very different my example of algebraic structures. Monoid: the monoid of words over a finite alphabet. Group: the group of words over a finite alphabet. Ring: the polinomial …
0 votes
1 answer
464 views

Weak algebraic structures

The following question can be thought as a sequel of this one. Here I'm looking for a big list of example of weak algebraic structures: here weak means that the structure (i.e. operations) need not …
Giorgio Mossa's user avatar