Why You Can't Solve Every Equation (and Why That's Awesome)
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But why is there no quintic formula? | Galois Theory
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Why you can't solve quintic equations (Galois theory approach) #SoME2
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The strange cousin of the complex numbers -- the dual numbers.
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The secret behind constants
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How to Get to Galois Theory Naturally
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solving equations but they get increasingly awesome
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What determines the size of an atom?
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