Is the element required if its multiplicity is not specified?
126751
XML Schema minOccurs / maxOccurs default values
38083
Order of conjugate of an element given the order of its conjugate
84382
Sole minimal element: Why not also the minimum?
10138
How to avoid NoMethodError for missing elements in nested hashes, without repeated nil checks?
112049
How many elements does $\mathcal{P}(A)$ have?
134177
Using setminus notation with set elements
67310
The multi-part identifier could not be bound
81070
Why must the eigenvalue of the number operator be an integer?
100072
Can we add an uncountable number of positive elements, and can this sum be finite?
73359
Warning: array_combine(): Both parameters should have an equal number of elements
118472
Is there a systematic way of finding the conjugacy class and/or centralizer of an element?
95777
DTD required elements ordering
131650
If a function can only be defined implicitly does it have to be multivalued?
146457
including but not limited to - explain this sentence
14008
Why taking components of a component of a vector is invalid?
91633
Why don't we just use element IDs as identifiers in JavaScript?
32722
Necessity of Brackets for Integration