Month: February 2020

Dr. J’s Guide to Cardinality

Dr. J introduces the idea of cardinality, the size of a set. Three categories are discussed: finite, countably infinite, and uncountably infinite. Sets with finite size are those where you can count the elements and eventually stop. Sets with countably infinite size can be put into one-to-one correspondence with the natural numbers. Sets with uncountably …

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Dr. J’s Guide to Venn Diagrams

Dr. J introduces Venn Diagrams which are a visual illustration of sets. Venn Diagrams are then used to visually demonstrate subsets and supersets as well as the set operations of union, intersection, set difference, and complement.