- 不等式 bùděngshì inequality(math) a mathematical expression indicating that two quantities or formulas are not equal
- 不等号 bùděnghào inequality signa mathematical symbol used to show that two values are not equal, such as [[不等于号|不等於號|bu4 deng3 yu2 hao4]], [[大于号|大於號|da4 yu2 hao4]], or [[小于号|小於號|xiao3 yu2 hao4]]
- 不等价交换 bùděngjiàjiāohuàn unequal exchange(economics) the exchange of unequal values
- 不等于号 bùděngyúhào inequality signthe mathematical symbol used to indicate that two values are not equal
- 不等边三角形 bùděngbiānsānjiǎoxíng scalene trianglea triangle where all three sides have different lengths
- 不等额选举 bùděng'éxuǎnjǔ competitive electionelection system where the number of candidates exceeds the number of seats available
- 等周不等式 děngzhōubùděngshì isoperimetric inequalitythe isoperimetric inequality
