Tī sò͘-ha̍k tiong, siông-sò͘ hâm-sò͘ (常數函數; constant function) sī chi̍t chióng sò͘-ta̍t bōe hoat-seng kái-piàn (iā chiū sī siông-sò͘) ê hâm-sò͘, ē-ēng pī piáu-sī chò f ( x ) = c {\displaystyle f(x)=c} .
