List questions from convention | MathQa

Can a disconnected surface have a (negative) genus?

Published on 12 Jan 2025 - 21:56

What's the usual convention for directional derivatives in the $0$ direction?

Published on 12 Jan 2025 - 22:14

Skeptical about (my understanding of) wikipedia's definition of a reflective subcategory.

Published on 12 Jan 2025 - 22:18

asin, arcsin, $\sin^{-1}$ - is there any convention?

Published on 12 Jan 2025 - 21:48

When talking about periods of a function why is it common to introduce a factor of $2$?

Published on 13 Jan 2025 - 2:19

Handwriting cardinal numbers

Published on 12 Jan 2025 - 18:15

How to find the difference between two numbers

Published on 12 Jan 2025 - 21:55

Is there an analog of $\epsilon$ in complex analysis?

Published on 12 Jan 2025 - 21:58

Is there an open / established categorization / list of terms / concepts and synonyms for mathematics?

Published on 12 Jan 2025 - 22:19

How would this combinatorial process be written in conventional mathematical notation?

Published on 12 Jan 2025 - 22:18