🚀 go-pugleaf

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---
	a x^4 + b x^3 + c x^2 + d x + e == 0

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	u^4 + p u^2 + q u + r == 0

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	t^3 + 2 p t^2 + (p^2 - 4 r) t - q^2 == 0

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	u3,4 = (- Sqrt[t1] $@!^(J ( Sqrt[t2] - Sqrt[t3] ))/2

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---
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	x^4 + x^3 == 0

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--
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