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Convergence articles

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Prove that if the sums of the square opposite sides of any quadrilateral are equal, its diagonals interect at right angles.
There are two numbers whose sum equals the difference of their squares.
This 1989 revision of the 1969 NCTM yearbook still provides wonderful suggestions for using the history of mathematics in the classroom.
A biography of Arthur Cayley, the outstanding mathematician of Victorian Britain.
The ICM meets every four years. This year, the meeting takes place August 22-30 and is being held in Madrid. Section 20 of the Congress deals with the history of mathematics.
On a certain ground stands two poles 12 feet apart, the lesser pole is 35 ft. in height and the greater 40 ft. It is sought, if the greater pole will lean on the lesser, then in what part will it touch?
Portraits of 92 living mathematicians, with autobiographical comments.
The Midwest History of Mathematics Conference will take place in the Reinhart Center of Viterbo University, LaCrosse, Wisconsin, on October 3 and 4, 2008.
Whimsical posters of fifteen mathematicians with brief biographies.
Now a pile of rice is against a wall, it has a base perimeter of 60 feet and a height of 12 feet.