User talk:Usagiop

Welcome to ProofWiki! Since you're new, you may want to check out the general help page. It's the best first stop to see how things are done (next to reading proofs, of course!). Please feel free to contribute to whichever area of mathematics interests you, either by adding new proofs, or fixing up existing ones. If you have any questions please feel free to contact one of the administrators, or post your question on the questions page.

Here are some useful pages to help get you started:
 * Community Portal - To see what needs to be done, and keep up to date with the community.
 * Recent Changes - To keep up with what's new, and what's being added.
 * Check out our house style if you are keen on contributing.
 * Main Page talk - This is where most of the main discussions regarding the direction of the site take place. If you have any ideas, please share them!

Cheers! prime mover (talk) 20:09, 7 May 2022 (UTC)

Preimages
FWIW $f^{-1} \sqbrk U$ as opposed to $\map {f^{-1} } U$ is the preferred notation for preimages. Caliburn (talk) 10:39, 21 May 2022 (UTC)

OK, thanks! Usagiop


 * added that essential note of clarifxion to page in qn --prime mover (talk) 13:45, 21 May 2022 (UTC)

Links with underscores
Please, when implementing an internal link, enter it without underscores. Otherwise it makes maintenance irritatingly more difficult.

Thx for co-ops. --prime mover (talk) 19:38, 21 May 2022 (UTC)