Accumulation point of open interval in real numbers
69283
The limit points of an open interval (open set)
75882
Countability of local maxima on continuous real-valued functions
121366
Intervals and cardinality
68976
Given real numbers: define integers?
102307
Discrete Math Proofs Involving Real Numbers
623
variation of a function over countable intervals
73130
A simple question about open set
84359
On Lebesgue Outer Measure of an interval
125821
Evaluating limits at positive and negative infinity
90696
Series in Real Analysis
56728
Question about limit points of a Subset of $\mathbb{R}$
18222
Set of continuity points of a real function
22101
Difference Between Limit Point and Accumulation Point?
127900
Interior of closure of open set in topological space
24266
Accumulation points of the set $S=\{(\frac {1} {n}, \frac {1} {m}) \space m, n \in \mathbb N\}$
60485
Show that $S^1 - \lbrace (1,0)\rbrace$ is homeomorphic to the open interval $(0,1)$
94363
Prove: Any open interval has the same cardinality of $\Bbb R$ (without using trigonometric functions)