## Mathematics, Minus and Plus: (minus Some Old Rules and Plus Some New Ones). |

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This book should be listed under comedy, it's a joke.

The author is operating under the rather common misconception that PI is an arbitrarily defined number. PI is a fundamental constant of Euclidian geometry, the ratio is the same regardless of the measurement unit, numerical system, or calculation method used. Attempting to redefine it is literally illogical.

Many otherwise intelligent people have made this same mistake, for example:

In Carl Sagan's book CONTACT he has an advanced race alter the value of PI to hide a message

This is impossible, if you are using Euclidian geometry PI is fixed, if PI isn’t fixed it's not

Euclidian geometry.