Tricki
a repository of mathematical know-how
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Equation-solving front page
Differential equations front page
How to solve cubic and quartic equations
How to solve linear equations in one variable
How to solve quadratic equations
Transform equation to reach a solved pattern
What makes some equations so much easier to solve than others?
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Recent articles
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Geometric view of Hölder's inequality
Diagonal arguments
Finding an interval for rational numbers with a high denominator
Try to prove a stronger result
Use self-similarity to get a limit from an inferior or superior limit.
Prove a consequence first
Lower degree by increasing dimension (or vice-versa)
Numerical optimization
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