This symbol $'$ for $p',q'$, etc; I know $'$, it is called prum(?) or something close to that, and $p',q'$ are p prum, q prum.
But what exactly is $'$ written or pronounced? Thanks.
And why is that called prum(?)?
2026-04-03 15:40:46.1775230846
How do we pronounce this symbol $'$ for $p',q'$, etc. And why?
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