How to make a set of real numbers symbol, but empty inside, like in the picture?
348
How to look up a symbol or identify a letter from a math alphabet or other character?
20135
Measure of  reals in $[0,1]$ which don't have $4$ in decimal expansion
50151
"Closed" (square) root symbol
4302
How can I redefine \int to put a negative space after the integral sign, but keep the limits properly set?
118145
Mathematical symbol for disjoint set union
138262
How do you easily create empty matrices javascript?
125957
What is the product of the empty set?
44314
How do I create "double-struck" square brackets in math mode?
18081
How to format numbers to same number of digits, 0-padded?
31774
How do I typeset arbitrary fractions like the standard symbol for .5 = ½?
151090
Creating A Nested Mathematical Sets Inside A Rectangle
93676
Syntax of Using Math Mode: Empty Lines (Beginner Question)
50906
How to write special set notation by hand?
150555
Change the size of a math symbol
61474
How to typeset indices before a symbol?
125036
How can I get a "divide by" symbol with \usepackage{physics}?
148649
How do I get a slanted \sum symbol?