# Science and Mathematics

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## Mathematics

The most common errors in undergraduate mathematics (External)

Top-Down Calculus (free e-book) (External)

Earliest Uses of Various Mathematical Symbols (External)

OpenStax - Math (free e-books) (External)

Rectangle Intersection Demonstration (External)

Generating Worlds with Wave Function Collapse (External)

WebWork Problem Library (External)

## Physics

Impact and Explosion Effects calculator (External)