# Questions tagged [mnemonic]

Questions related to memory devices that help learners recall larger pieces of information, especially in the form of lists like characteristics, steps, stages, parts.

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### Is there a handy mnemonic or visual aid for all the basic set theory function relations, such as $f(A\cap B)\subseteq f(A)\cap f(B)$?

Glancing at Appendix A of John Lee's Introduction to Topological Manifolds, I noticed the following list of rules: I'm familiar with rules like these and have no trouble proving them—that's not my ...
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### Has anyone heard of the "Of" operator, and if yes then what does it represent?

Where I studied (India), in my school we were taught BODMAS as Brackets, Of, Division, Multi, Add, Sub. With "Of" being the Of operator as in 1/2 Of 4 ie. Literally - 1/2 parts of 4 Can ...
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### Am I the only one constantly forgetting the Eisenstein criterion? [closed]

Do you guys have tricks to remember the Eisenstein criterion? I constantly forget it and I am looking for some logic in it to never forget it again.
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### Mnemonic for Integration by Parts formula?

The Integration by Parts formula may be stated as: $$\int uv' = uv - \int u'v.$$ I wonder if anyone has a clever mnemonic for the above formula. What I often do is to derive it from the Product Rule ...
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### How to remember which is lower/upper semicontinuity?

There are several ways in which continuity can be formulated as two conditions - in a way such that one of them is lower semicontinuity and the other one is upper semicontinuity. (See below for ...
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