@Luigi0210 double integrals .-.
\[S_n = \sum_{k=1}^{n} \] \[f(x_k,y_k) \Delta A_k \]
If f is continous throughout R, then ,as you refine the mesh or two dimensional partition width to make both delta x and delta y go to zero, the sums in the first equation approach the limit called the double integral of f over R.
\[\int\limits_{}^{} \int\limits_{R}^{} f(x,y) dA\]
you could also write it as \[\int\limits_{}^{} \int\limits_{}^{R} f(x,y) dx~dy\]
the R is on the bottom* i messed up with latex ..
\[\int\limits_{}^{}\int\limits_{R}^{} f(x,y)~dA = \lim_{\Delta A \rightarrow 0}\sum_{k=1}^{n} f(x_k,y_k) \Delta A_k\]
This makes me miss calculus more ;-;
what are you taking ? o.o
Nothing at all, which is why college is boring for me \[\large no math/science=boring=\not doing anything=\not doing hw=failing college=failing life=horrible life=hobo=death \]
*no math/science=boring=not doing anything=not doing hw=failing college=failing life=horrible life=hobo=death
D:
True story bro
dat sucks man, it'll get better .-.
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