Topic summary∫ Expand Summary Extracted from the Wikipedia article Integral symbol. Typography in other languages∫05f(t)dt,∫g(t)=ag(t)=bf(t)dt.{\displaystyle \int _{0}^{5}f(t)\,\mathrm {d} t,\quad \int _{g(t)=a}^{g(t)=b}f(t)\,\mathrm {d} t.} Wikipedia source