http://mathworld.i2p/FirstRingIsomorphismTheorem.html
See also Second Ring Isomorphism Theorem , Third Ring Isomorphism Theorem , Fourth Ring Isomorphism Theorem This entry contributed by Nick Hutzler References Dummit, D. S. and Foote, R. M. Abstract Algebra, 2nd ed. Englewood Cliffs, NJ: Prentice-Hall, 2003. Referenced on Wolfram|Alpha First Ring Isomorphism Theorem Cite this as: Hutzler, Nick . " First Ring Isomorphism Theorem. " From MathWorld --A Wolfram Web Resource, created by Eric W.