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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.

26 votes
11 answers
7k views

Different ways of thinking about the derivative

In Thurston's philosophical paper, "On Proof and Progress in Mathematics", Thurston points out that mathematicians often think of a single piece of mathematics in many different ways. As an example, …
5 votes

Most harmful heuristic?

"Mathematical knowledge is contained and communicated primarily by documents." I'm not sure if this is a heuristic, but in terms of beliefs that inhibit learning, this is definitely the one that hurt …
16 votes

Most harmful heuristic?

Any attempt to draw a fat Cantor set is a bad heuristic in my opinion. I saw such a diagram as an undergrad and believed for a while that there were intervals contained in the fat Cantor set. I don' …
68 votes

Most harmful heuristic?

One extremely harmful heuristic I held until fairly recently: identifying math with algebraic manipulation. When asked to prove an identity or an inequality I would often dive straight into algebraic …