The knowledgebase is a categorized collection of answers to frequently asked questions (FAQ) and articles. You can read articles in this category or select a subcategory that you are interested in.
Links: Ask Dr. Math
Home page of Ask Dr. Math: http://mathforum.org/dr.math/ FAQ of Ask Dr. Math: http://mathforum.org/dr.math/faq/ Selected answers from Ask Dr. Math: 

Links: Math Encyclopedias
Wolfram MathWorld, An encyclopedia of mathematical topics (advanced) Wikipedia. An encyclopedia of everything, which is often excellent on mathematical topics. 

Links: History of Mathematics
MacTutor History of Mathematics archive: Math history, by person and by topic 

Links: Finding formulas for sequences or numbers
OnLine Encyclopedia of Integer Sequences: Find a formula for a sequence from a list of terms Inverse Symbolic Calculator: Find a formula for a given number 

Links: Units of Measurement
How Many? A Dictionary of Units of Measurement: Definitions and history of every unit ever used ... 
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