In mathematics and logic, a corollary is a theorem of less importance which can be readily deduced from a previous, more notable statement. A corollary could, for instance, be a proposition which is incidentally proved while proving another proposition; it might also be used more casually to refer to something which naturally or incidentally accompanies something else.

उपप्रमेय वह कथन है जो किसी प्रमेय से सीधे और स्पष्टत: निकल जाता है। इस शब्द का भी कोई औपचारिक परिभाषा नहीं है कि किसे "प्रमेय" कहा जाय और किसे उपप्रमेय।