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f in (-oo:+oo)
f^4 = 1/3 // - 1/3
f^4-(1/3) = 0
f^4-1/3 = 0
1*f^4 = 1/3 // : 1
f^4 = 1/3
f^4 = 1/3 // ^ 1/4
abs(f) = (1/3)^(1/4)
f = (1/3)^(1/4) or f = -(1/3)^(1/4)
f in { (1/3)^(1/4), -(1/3)^(1/4) }
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