- 10th
- 01:04
The Essence of Spherical Geometry, Part 1
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- 24th
- 04:47
Spherical Geometry 2 -- Deficits Matter
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05:44Spherical Geometry 3 -- A bit of Circular Reasoning
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- 25th
- 17:26
Spherical Geometry 4 — Mommy, Where Does Trigonometry Come From?
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