> [!tldr] There are 5 methods ## [[Boolean Logic|Boolean]] Rules Any well-defined set of rules can be used to create a set. > [!example] > - Humans who are taller than Nick > - Humans who are not taller than Nick ## Complete [[Enumeration]] Simply list all the set members (for [[Infinity|non-infinite]], discrete objects). > [!example] > The set of Larry, Curly, and Moe ## With a Characteristic Function Using a set-defining mathematical function. This feels slightly overlapped with the first one. > [!example] > - Solutions to `x = y^3-4` ## With Recursion I'm still not getting this one, so here's the example pulled directly from the source: ![[IMG_1746.jpeg]] ## With Operators on Other Sets Utilizing existing sets along with things like UNION, using these symbols. ![[IMG_1745.jpeg]] **** # More ## Source - [[The Engineered Design of Systems]]