In mathematics, the plastic number ρ (also known as the plastic constant) is a mathematical constant which is the unique real solution of the cubic equation
It has the value
its decimal expansion begins with 1.324717957244746025960908854....
The plastic number is also sometimes called the silver number, but that name is more commonly used for the silver ratio .
Read more about Plastic Number: Properties, History
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—Henry David Thoreau (1817–1862)