added fixed video to youtube
Merge branch 'development' of github.com:ASCTech/mooculus into development
removed stray +
made minor correction to text
fixed answer
added something about one-sided limits and differentiability
fixed typo
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ready to go - including clark archer's fix
Merge branch 'development' of github.com:ASCTech/mooculus into development
textbook is ready
Merge branch 'development' of github.com:ASCTech/mooculus into development
Merge branch 'development'