A question on integral notations

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Good day!

I just would like to ask some notations involved in integration. Specifically, given a filtered probability space $(\Omega, F_t, \{F_t\}, P )$

$$\displaystyle E\bigg[\int_0^t f(s-)dA(s)\bigg] $$ Where $A$ is an increasing mapping.

Im confuse what is the meaning of $f(s-)dA$. This maybe is basic but I’m new i really dont understand the meaning of such. Any help is highly appreciated or any references where this concepts are being discussed.