Section 4.6 Reference Topics

The most famous real numbers that are not rational are the numbers pi and e. However there are many interesting constants in mathematics, as described at the following site:
http://www.mathcad.com/library/constants/index.htm

This site answers some questions about numeration systems:
http://www.math.toronto.edu/mathnet/answers/numbersystems.html

The number 0, the additive identity, is the subject of many web sites:
http://www.math.toronto.edu/mathnet/plain/questionCorner/zeroorigin.html

http://mathforum.org/dr.math/problems/purpose_zero.html

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