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Re:Intuition in Mathematics (2012) [pdf] by jackcarter on Monday January 23, 2017 @10:22AM (#13462747)
Using "to be" isn't necessarily the passive voice. The author doesn't use the passive voice in those sentences.

http://writingcenter.unc.edu/handouts/passive-voice/

Re:Intuition in Mathematics (2012) [pdf] by jnbiche on Monday January 23, 2017 @01:32PM (#13464552)
You're absolutely right, I misread those.

Passive voice would be "to be drawn", "to be read", etc.

Thank you.