- #1
player1_1_1
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- 0
Homework Statement
Why figure area is defined as defined integral? i have signature
[tex]P=\int\limits^b_af^{\prime}(x)\mbox{d}x=f(b)-f(a)[/tex]
what is a prove of this signature? I have other signature:
[tex]P=\lim_{n\to\infty}\sum\limits^n_1\left(x_{i+1}-x_i\right)f\left(x_i\right)[/tex]
how it can be proved that these signatures are equivalent? why can't I define figure area under [tex]f(x)[/tex] in a and b limits as ex. [tex]P=f^{\prime}(b)-f^{\prime}(a)[/tex]?