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www.mathsisfun.com
| | www.johnmyleswhite.com
8.1 parsecs away

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| | Recently a friend asked me to help her learn enough math to take the GRE's. My response was to give her the first problem that I thought she should be able to solve before we discussed anything else. It was a very simple problem from the perspective of a mathematician, but one that is not simple enough to solve only using the approaches to problem-solving that are usually taught in American high schools.
| | kaue.me
5.5 parsecs away

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| | Mathematics - Algebra - Quadratic Equation Formula Derivation - Step By Step Kaue's Way of Life.
| | parametricity.com
13.0 parsecs away

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| | There's a famous dubious argument that "proves" the set of $\mathrm{Tree}$ of (planar, rooted) binary trees is in bijection with the set of $7$-tuples of trees $\mathrm{Tree}^6$.
| | www.publichealth.columbia.edu
47.4 parsecs away

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| Learn more about the exciting programs in the different departments of public health at the School.