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The “Pons Asinorum”

# The “Pons Asinorum”

Wikipedia says:
Pons Asinorum (Latin for “Bridge of Asses”) is the name given to Euclid’s fifth proposition in Book 1 of his Elements of geometry, the theorem on isosceles triangles:

In isosceles triangles the angles at the base are equal, and, if the equal straight lines are produced further, then the angles under the base are also equal.

One hypothesis as to why the theorem is called the Pons Asinorum is that it separated the “intelligent” from the “fools,” who could not grasp the theorem. Answers.com says of the term Pons Asinorum:
The bridge of asses. Traditionally it is hard to get asses to cross a bridge. In mathematics, the term is applied to the problem from the first book of Euclid that if two sides of a triangle are equal then the angles opposite those sides are also equal. Syllogistic logic had its own pons asinorum: the inventio medii. The Oxford Dictionary of Philosophy. Copyright the Oxford University Press, 1994, 1996, 2005. Answers.com 13 May. 2009.