George Cantor (1845—1918), the creator of the set theory, made considerable contributions to the development of the theory of real… Click here to read more

$${k_2} \in \mathbb{R}$$ such that $${k_1} \leqslant {u_n} \leqslant {k_2}$$, $$\forall {\text{ }}n \in \mathbb{N}$$. Equivalently, $$u$$ is bounded if… Click here to read more