(1 − z) / (1 + z)
The Endeavour 2024-09-26
Summary:
“I keep running into the function f(z) = (1 − z)/(1 + z).” I wrote this three years ago and it’s still true. This function came up implicitly in the previous post. Ramanujan’s excellent approximation for the perimeter of an ellipse with semi-axes a and b begins by introducing λ = (a − b)/(a + […]
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