This is the Riemann-Stieltjes illustration of the Fundamental Theorem of Calculus. $$\int_{a}^b \ \mathrm{d}\alpha(x) = \alpha(b) - \alpha(a)$$
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This is the Riemann-Stieltjes illustration of the Fundamental Theorem of Calculus. $$\int_{a}^b \ \mathrm{d}\alpha(x) = \alpha(b) - \alpha(a)$$