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How can I make the larger integration sign without using this $$...$$ Since I have written that

$(Uu)(x,y)=\dfrac{1}{\Gamma(r_1)\Gamma(r_2)} \int\limits_0^x \int\limits_0^y \dfrac{F(x,y,s,t,u(s,t))}{(x-s)^{1-r_1}(y-t)^{1-r_2}}dt\;ds,$

but the output integration is looking small so I want to make large integration without using $$....$$ so please help me.

Torbjørn T.
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user114673
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