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when toggle format what by license comment
Dec 12, 2019 at 20:57 vote accept Hedgehog
Dec 12, 2019 at 20:56 answer added Hedgehog timeline score: 2
Dec 12, 2019 at 0:58 history edited Hedgehog CC BY-SA 4.0
Corrected that question relates to psi not phi in MathWorld notation
Dec 4, 2019 at 2:33 history edited Hedgehog CC BY-SA 4.0
Clarified question
Dec 3, 2019 at 10:52 history asked Hedgehog CC BY-SA 4.0