What is combinatorics? - Mathematics Stack Exchange In fact,I once tried to define combinatorics in one sentence on Math Overflow this way and was vilified for omitting infinite combinatorics I personally don't consider this kind of mathematics to be combinatorics, but set theory It's a good illustration of what the problems attempting to define combinatorial analysis are
combinatorics - What is a combinatorial proof exactly? - Mathematics . . . Combinatorics is a wide branch in Math, and a proof based on Combinatorial arguments can use many various tools, such as Bijection, Double Counting, Block Walking, et cetera, so a combinatorial proof may involve any (or a combination) of these
combinatorics - How To Tell When Order Matters Or Not - Mathematics . . . Comically badly worded question - particularly amusing is the phrase 'each card displays one positive integer without repetition from this set' :) it's almost like the output of a bot fed elementary combinatorics questions!