- 不等式 bùděngshì inequalityinequality (math.)
- 不等号 bùděnghào inequality signinequality sign (≠, <, ≤, >, ≥)
- 不等价交换 bùděngjiàjiāohuàn unequal exchangeexchange of unequal values
- 不等边三角形 bùděngbiānsānjiǎoxíng scalene triangle
- 等周不等式 děngzhōubùděngshì isoperimetric inequalitythe isoperimetric inequality