LEC CAL2 2

Review of LEC ANA1 26, LEC ANA1 27, LEC ANA1 28. Introduced integration over $n$-dimensional rectangles $R=[a_1,b_1]\times \cdots \times [a_n,b_n]$, and the $n$ dimensional length analog $\text{vol}(R)={\prod }_{i=1}^n(b_i-a_i)$.