\int_{0}^{1}f\left( x \right)\mspace{2mu}\mathbb{d}x = \sum\limits_{i = 0}^{\infty}x_{i} = \prod\limits_{i = 0}^{\infty}x_{i} = \coprod\limits_{i = 0}^{\infty}x_{i} = \oint_{0}^{1}f\left( x \right)\mspace{2mu}\mathbb{d}x = \iint_{0}^{1}f\left( x \right)\mspace{2mu}\mathbb{d}x = \iiint_{0}^{1}f\left( x \right)\mspace{2mu}\mathbb{d}x
