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March 16th, 2016, 11:12 PM   #11
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Originally Posted by skipjack View Post
Also, the book is clearly incorrect if the lines m and m needn't both lie in the same plane as the fold line.
I think the book implied this implicitly...
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March 17th, 2016, 12:15 AM   #12
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For the book to be correct, these assumptions are needed:
  • the lines m and n are straight and have no endpoints,
  • the lines m and n lie in the same plane as the fold line,
  • a line that coincides with the fold line doesn't fold onto itself, and
  • the lines m and n are distinct (or considered parallel if they coincide).
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