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I'm hyp cos, and $$ch(x)=\frac{e^x+e^{-x}}{2}$$. If you hang a rope, it looks like the image of y=ch(x).

## Have a look at my stuff

R function series:

Array notation - another work based on the idea of R function

Dropping hydra - a simplified variant of DAN or R function

Second generation dropping notation - The third attempt of second generation Array notation. Array is actually over-complicated but improves nothing from hydra-based notation. Since it definitely doesn't follow the syntax from first generation, I could make it a hydra notation instead of an array notation. It contains this only part:

1. Nested dropper notation

But it still fails.

## Not my stuff, just category something

List of perfect powers up to $$10^7$$

A list of links to Saibian's ExE googologisms