Is a variable/arbitrary element a precisely defined mathematical object?
119901
Why is variable called "variable" in mathematics if in fact it's immutable?
98001
What really is an indeterminate form?
33164
Formal basis for variable substitution in limits
118472
Is there a systematic way of finding the conjugacy class and/or centralizer of an element?
11629
Can a discrete variable take on multiple values, and thus truth values, simultaneously in the mathematical proof below or elsewhere?
84421
variable === undefined vs. typeof variable === "undefined"
2796
How to tell Mathematica that certain variables are real/imaginary, integer-valued, etc
53661
Intuition surrounding units in $R[x]$
127664
Inverse elements in the absence of identities/associativity.
106211
Is the universe isomorphic to a universal turing machine?
11091
About free and bound variables
48028
True Definition of the Real Numbers
125117
What is the type of variable?
133551
How to create functions of arbitrary number of variables?
100378
Are there "All" and "Any" functions in Mathematica?
973
Is the property "being a derivative" preserved under multiplication and composition?
144181
Given an arbitrary set $X$, can one always find an element outside $X$?