check

https://en.wikipedia.org/wiki/Category:Mathematical_concepts https://en.wikipedia.org/wiki/Outline_of_algebraic_structures https://en.wikipedia.org/wiki/List_of_abstract_algebra_topics

https://en.wikipedia.org/wiki/Space_(mathematics) https://en.wikipedia.org/wiki/Binary_relation https://en.wikipedia.org/wiki/Converse_relation https://en.wikipedia.org/wiki/Isomorphism https://en.wikipedia.org/wiki/Map_(mathematics) https://en.wikipedia.org/wiki/Bijection https://en.wikipedia.org/wiki/Function_(mathematics) https://en.wikipedia.org/wiki/Graph_of_a_function https://en.wikipedia.org/wiki/Binary_relation

math.stackexchange

https://math.stackexchange.com/questions/177937/difference-between-space-and-mathematical-structure https://math.stackexchange.com/questions/2334589/pairwise-disjoint-or-disjoint?rq=1

Abstract Math

Math structure http://www.abstractmath.org/MM/MMMathStructure.htm

Math object http://www.abstractmath.org/MM/MMMathObj.htm

Math definition http://www.abstractmath.org/MM/MMDefs.htm

Math function http://www.abstractmath.org/MM/MMFuncExamples.htm

http://www.abstractmath.org/MM/MMTOC.htm http://www.abstractmath.org/MM/MMIndex.htm http://www.abstractmath.org/MM/MMUnderstandingMath.htm http://www.abstractmath.org/MM/MMOtherAspectsUnderstanding.htm http://www.abstractmath.org/MM/MMIntro.htm