(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

**Physics Forums - The Fusion of Science and Community**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# R/A mod out by A ?

**Physics Forums - The Fusion of Science and Community**