
thumb|alt=A colorful graphic with brightly colored loops that grow in intensity as the eye goes to the right|Domain coloring of the holomorphic tetration {}^{z}e, with [[hue representing the function argument and brightness representing magnitude]] thumb|alt=A line graph with curves that bend upward dramatically as the values on the x-axis get larger|{}^{n}x, for , showing convergence to the infinitely iterated exponential between the two dots
thumb|alt=A colorful graphic with brightly colored loops that grow in intensity as the eye goes to the right|Domain coloring of the holomorphic tetration {}^{z}e, with [[hue representing the function argument and brightness representing magnitude]] thumb|alt=A line graph with curves that bend upward dramatically as the values on the x-axis get larger|{}^{n}x, for , showing convergence to the infinitely iterated exponential between the two dots
In mathematics, tetration (or hyper-4) is an operation based on iterated, or repeated, exponentiation. There is no universal notation for tetration, though Knuth's up arrow notation \uparrow \uparrow and the left-exponent {}^{x}b are common.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).