(adsbygoogle = window.adsbygoogle || []).push({}); R/A "mod out by A"??

Hi, can someone please explain to me what "modding out by A" means?

R is ring and A is subring of R

R/A = {r+A|r in R} I understand that R/A is a bunch of left cosets

and when A is an ideal of R then R/A is ring

but what is all this talk of modding out?

any input would be great

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# R/A mod out by A ?

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