Rikki inserted div_References_nbsp_br_div__.html into layout  over 8 years ago

Commit id: effbf5d39da1a28b67ac59c03d14f25eff0f3727

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div_A_more_mathematical_definition__.html  figures/Screen Shot 2016-02-09 at 7.29.27 PM/Screen Shot 2016-02-09 at 7.29.27 PM.png  Suggested_Exam_Problem_Zack_goes__.html  div_References_nbsp_br_div__.html