定理
dìng​lǐ

theorem

dìng​lǐ theorem · established truth
  1. 定 dìng particleverb
    fixed
    (bound form) stable; settled; already agreed upon or established by rule
  2. 理 lǐ verbnoun
    reason
    reason; logic; truth; a law or principle governing how things work

dìng​lǐ regulation
  1. 定 dìng verb
    to decide
    to fix; to set; to determine; to reach a decision
  2. 理 lǐ verbnoun
    reason
    reason; logic; truth; a law or principle governing how things work