Tag: general-topology
- Definitions of connectedness on rings
- Is every Lindelöf space Menger
- The coset/quotient space of a normal subgroup of a topological group is a topological group
- Rudin Real Analysis exercise 2.13, question about last part.
- A metrizable space is realcompact iff it has non-measurable cardinality
- On Heine-Borel Theorem for any compact set.
- Are $O(n)$ and $SO(n)\times Z_2$ homeomorphic as topological spaces
- Prove that it is first countable
- The closest point to $x_0$ exists in a compact subset $K$
- A $\sigma$-compact but not hemicompact space