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Convergence articles

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There is a number which when divided by 2, or 3, or 4, or 5, or 6 always has a remainder of 1 and is truly divisible by 7. It is sought what is the number?
This is the title page of the Margarita philosophica (Pearl of Wisdom) of Gregor Reisch (1467 - 1525). The first edition was published in 1503. This work was used as a university textbook in the early sixteenth century.
A discussion of aspects of Leonardo of Pisa's Book of Squares.
Eratosthenes' measurement of the earth, in a form that's easy for teachers to use in the classroom.
Having been given the perimeter and perpendicular of a right angled triangle, it is required to find the triangle.
The author takes us on a historical tour of mathematics through postage stamps of the world that display mathematicians and mathematics.

Problems from a 15th century French manuscript, including one with negative solutions

The incircle O(r) of triangle ABC touches AB at D, BC at E and AC at F. Find r in terms of AD, BE and CF.

A circle is inscribed in an isosceles trapezoid. Find the relationship of the radius to the sides.

A comparison of the Greek and Chinese approach to the idea of similarity.

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