(CNN) — “Drop to the ground; take cover by getting under a sturdy table or other piece of furniture; and hold on until the shaking stops.” This is the official advice issued by FEMA for anyone unlucky ...
Having high school students prove geometrical propositions became the norm in the United States with the reforms of the 1890's - when geometry was designated as the place for students to learn the ...
J. R. Brown, Philosophy of mathematics: an introduction to the world of proofs and pictures, Routledge (1999). 2. R. B. Nelsen, Proofs without words I: exercises in ...
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