Macro. Returns φ, the "golden mean" or "golden ratio".
PHI
1.61803398874989484820
This constant can be derived by solving the following set of equations:
if |
a/b = b/(a + b) |
and |
a = 1 |
then |
b = φ |
PHI is the positive root of the polynomial
PHI is particularly useful if you happen to be an ancient Greek.