This booklet introduces the reader to the overall conception of partly ordered units, i.e., posets. The textual content is gifted in a slightly casual demeanour, with fascinating examples and computations, which depend upon the Hasse diagram to construct graphical instinct for the constitution of finite posets. The proofs of a small variety of theorems is incorporated within the appendix. vital examples in particular the Letter N poset, which performs a job equivalent to that of the Petersen graph in supplying a candidate counterexample to many propositions, are used time and again through the textual content.
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