theorem

n 1 rule in algebra, etc, esp one expressed as a formula （代数等的）定理（尤指以公式表示的）. 2 mathematical statement to be proved by a chain of reasoning （数学的）命题.

theism, theist, theistic, them, thematic, thematically, theme, theme park, theme song (also `theme tune), themselves, then, then and there, thence, theocracy, theocratic, theodolite, theologian, theological, theologically, theology, theoretical, theoretically, theorist, theorize, theorize, theorise, theory, theosophical, theosophist, theosophy, therapeutic, therapeutically, therapeutics, therapist, therapy, there, there and then, thereabouts, thereafter, thereby, therefor,