Fast Growing Hierarchy Calculator High Quality May 2026 150 Common Chinese Character List [Free PDF]

Use this tool to add tone marks to pinyin or to convert tone number (e.g. hao3) to tone marks.

Although you can use the red buttons to add tone marks, we highly recommend you use the number method (e.g. hao3) for speed and placement of the accent above the correct vowel. [Hint: Type "v" for "ü"]
Note: You do not need to use this tool to enter pinyin in this dictionary.

The functions in this hierarchy grow extremely rapidly, with F₃(10) already exceeding the number of atoms in the observable universe!

Dr. Halverson smiled the night the project won a modest award. “Calculators measure,” he said, tapping the bronze case. “They do not make choices. We do.” Mira looked at the lattice one last time. The nodes glowed faintly, like embers cooling after a storm. She slid the device back into its case and left the lab with an idea she could hold—a rhythm of constraint and release that, she thought, might help anything from startups to ecosystems to proofs grow faster and truer.

The (FGH) is a family of functions ( f_\alpha: \mathbbN \to \mathbbN ), indexed by ordinals ( \alpha ), that rigorously defines the concept of "very fast growth" in proof theory and computability theory. A high-quality FGH calculator goes beyond simple recursion—it must handle limit ordinals, fundamental sequences, and large countable ordinals up to (and beyond) the Bachmann–Howard ordinal.

: It enables mathematicians to explore the properties of rapidly growing functions more easily, potentially leading to new insights and theorems.