定理

dìnglǐ

noun #21,082

Measure Word

一个定理 gè

Meanings

1 theorem (mathematics)
2 established principle

Characters

fixed / established / certain

principle / logic / reason

Examples

勾股定理是数学中最著名的定理之一。

Gōu gǔ dìnglǐ shì shùxué zhōng zuì zhùmíng de dìnglǐ zhīyī.

The Pythagorean theorem is one of the most famous theorems in mathematics.

学生需要学会证明这个定理。

Xuéshēng xūyào xuéhuì zhèngmíng zhège dìnglǐ.

Students need to learn how to prove this theorem.

Tips

memory

定 (fixed / established) + 理 (principle / logic) = an established principle that has been proven — a theorem. Compare 公理 (axiom), which needs no proof.

Stroke Order

定 dìng

理 lǐ