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Combinatorial objects are everywhere. How many ways are there to make change for $1 using unlimited numbers of coins of all denominations? Each way is a combinatorial object. AMOF is part encyclopedia and part...
What is the difference between the arithmetic 3+5 = 5+3 and the algebraic a+b = b+c? One is a specific fact, another is a pattern valid in a multitude of situations. While arithmetic may hint at some regularities,...
At NOVA's Origins website, users can "journey back to the beginning of everything: the universe, Earth, and life itself." The web site offers a series of interactive modules where visitors can decide if life exists on...
In general, a triangle is defined by its three elements. SAS, ASA, and SSS provide three wellknown examples but there are many more. Bogomolny provides a table of constructions (linked to constructions) and invites...
Information on convex and discrete geometry. Applications and related fields and subfields; textbooks, reference works, and tutorials; software and tables; other web sites with this focus.

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