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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.

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What are the most misleading alternate definitions in taught mathematics?

I find simplicial homology very difficult. In particular, I find the idea of a simplicial complex very hard to comprehend, except in the case of an abstract simplicial complex. Although it's not equ …
10 votes

What are the most misleading alternate definitions in taught mathematics?

Since this is a big list, I might as well comment 5 years later. David Corwin mentioned tensor products, and the top post is about linear algebra, so I thought I would mention that, in my opinion, co …