If $w$, $x$, $y$, and $z$ are real numbers with $w < x$ and $y < z$, is the cardinality of the closed interval $[w,x]$ the same as that of $[y,z]$?
121366
Intervals and cardinality
122947
What is the cardinality of the set of infinite cardinalities?
93330
Cardinality of all cardinalities
105445
Are the rationals a closed or open set in $\mathbb{R}$?
7785
Cardinality of sum-set
12003
Cardinality of set of real continuous functions
102972
Cardinality of $\mathbb{R}^\mathbb{R}$ by diagonal argument
83713
If $z,w\in \mathbb{C}^{\times}$, then $|z+w|=|z|+|w|$ iff $w=tz$ for some $t\gt 0$
22391
Is the set of all pairs of real numbers uncountable?
96845
Question: Compare the cardinality between the sets $\Bbb R$ and $\Bbb N^{\Bbb N}$
38764
bound on the cardinality of the continuum? I hope not
79568
Cardinality of the set $D$
85076
Is it true that $d(x,Y)=d(x,y_0)$ for some $y_0 \in Y$ when $Y$ is closed?
28683
Sum of two closed sets in $\mathbb R$ is closed?
86914
Cardinality of the set of hyperreal numbers
20085
What's the cardinality of all sequences with coefficients in an infinite set?
16420
When does $\sqrt{wz}=\sqrt{w}\sqrt{z}$?