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clarify definition
The '''golden ratio''' is a number, commonly known as phi (<math>\varphi</math>), defined as
The '''golden ratio''' is a number, commonly known as phi (<math>\varphi</math>), defined to be the larger of the two solutions to
<math>\varphi^2 = \varphi + 1</math>. The value of phi is
<math>\varphi^2 = \varphi + 1</math>. The value of phi is