New posts in Elementary Set Theory

Is it correct to have understanding of logic with the use of set theory, to make learning it easier?

Is a well-ordered set always countable?

Confusion on why 2 equivalence classes are either equal or disjoint

Is it legitimate to quantify a variable twice?

Prove difference between a set and the union of other two sets

Defining ordered pairs using only first-order logic

What do we mean when we say "Let $x$ be an element of the set $\mathbb{R}$"?

How is this read correctly in maths , and meaning (about: sets)?

Prove or disprove that the set S is countable

Prove that $S = \{ f: [0,1]\rightarrow \mathbb{R} \ \text{continuous} : x\in\mathbb{Q}\implies f(x) \in \mathbb{Q}\}$ is. uncountable