Why $\bigcap \emptyset $ isn't defined?
27107
intersection of the empty set and vacuous truth
125161
Why is the Cartesian product of $A$ and $\varnothing$ empty?
62542
Why is the empty set considered an interval?
36930
Create an empty list in Python with certain size
16056
Is empty set element of every set if it is subset of every set?
61020
Python extend with an empty list bug?
77265
Default size for empty
118824
What is the complement of empty set?
126793
no room for new \count error
152165
Why is there no function with a nonempty domain and an empty range?
98391
example of a nonempty subset is closed under scalar multiplication but not a subspace
87511
Why can't I use sizeof in a preprocessor condition?
45508
Is the empty set a group?
100395
Are empty arrays no longer allowed by gcc?
23333
How can I expand a quoted variable to nothing if it's empty?
67064
Uncountable minus countable set is uncountable
129354
What is the pythonic way to avoid default parameters that are empty lists?