What set me moving was seeing the equation written as
Phi^2 = Phi + 1
which rapidly became
Phi^3 = Phi^2 + Phi etc.
I thought I saw Phi^2 = Phi + 1 on Ron Knott's page, but I've looked again and
can't find it.
The biggest problem with D'oh moments is they seem to come at decreasing
intervals with increasing age. :( in my case.
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