Correct the definition of triangle inequality to not include degenera…#375

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petertseng merged 3 commits intoexercism:masterfrom

durrellchamorro:master

Sep 21, 2016

Commits on Sep 12, 2016

Correct the definition of triangle inequality to not include degenerate triangles.
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Commits on Sep 13, 2016

Add clarity to the definition of triangle inequality.
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Commits on Sep 18, 2016

Improve explanation of the triangle inequality theorem and add a Dig Deeper section.
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