Counting the Number of Subsets in a Set

Problem: How many groups can be formed from 5 persons?

The Power Rangers

First, we represent the persons by small letters a, b, c, d, and e, and we denote a group whose members are c and d as {c, d}. We can have a group with 2 members, 3 members, 4 members, and 5 members.  The members in each group are listed below.  » Read more

Newton’s notebooks, now online

Cambridge University has recently made some of Isaac Newton’s important notebooks and papers online.  The collection includes his Trinity College Notebook, Waste Notebook where he developed most of calculus concepts,  Laboratory NotebookPrincipia Mathematica, and several of his notes in mathematics, hydrostatics, optics, alchemy, and chemistry.

Newton's Principia Mathematica

These notes can be viewed and explored at the Cambridge Digital Library. The notebook images can be downloaded under Creative Common license.

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