"Theorematical" is a word in ENGLISH

Containing many names or terms; multinominal; as, the polynomial theorem.

A theorem or proposition so easy of demonstration as to be almost self-evident.

The enunciation of a self-evident problem, in distinction from an axiom, which is the enunciation of a self-evident theorem.

To formulate into a theorem.

That which is considered and established as a principle; hence, sometimes, a rule.

A statement of a principle to be demonstrated.

One who constructs theorems.

Theorematic.

A numerical coefficient in any particular case of the binomial theorem.