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An informal blue jeans day, certainly. How jolly and farmer-like.
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I can't tell what's on the board. The instructor is looking towards
the ceiling for information or help or inspiration or ...
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Needs to lose weight, and should not be ashamed of the linear
approximation formula.
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Unique day: get dressed up (a tie!) to show how serious is the teaching and
learning of calculus.
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The day and time that Mr. Ferdinand
observed that the example's solution was much easier to compute than
the lecturer believed.
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