Pemalar matematik: Perbezaan antara semakan

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== Pautan luar ==
* [http://mathworld.wolfram.com/topics/Constants.html Constants - daripada Wolfram MathWorld]
* [http://oldweb.cecm.sfu.ca/projects/ISC/ Inverse symbolic calculator (CECM, ISC)] {{Webarchive|url=https://web.archive.org/web/20120329145758/http://oldweb.cecm.sfu.ca/projects/ISC/ |date=2012-03-29 }}
* [http://www.research.att.com/~njas/sequences/index.html On-Line Encyclopedia of Integer Sequences (OEIS)]
* [http://pi.lacim.uqam.ca/eng/ Simon Plouffe's inverter]