Partitions over permutations (opens in new tab)

I was thinking more about the cosine approximation to the Gaussian exp(−z²) ≈ (1 + cos(sin(z) + z))/2 that I wrote about last week. The two expressions above are close along the real axis but not along the imaginary axis. If z = iy, the right side grows much faster than the left, behaving like exp(exp(y)). This led to […] The post first appeared on .