na-adjective
infinitely differentiable
Mathematical term describing a function that can be differentiated any number of times. Used in analysis and differential topology.
この関数は無限回微分可能である。
This function is infinitely differentiable.
Compound of 無限 (infinite) + 回 (times) + 微分 (differentiation) + 可能 (possible). The derivation is transparent from its components.