Find two pairs where neither is the case ⟨x1,y1⟩⪯⟨x2,y2⟩, ⟨x1,y1⟩⪰⟨x2,y2⟩.
104034
Is $\le$ defined by $\langle 𝑥_1, 𝑦_1 \rangle \le \langle 𝑥_2, 𝑦_2 \rangle$, if $𝑥_1 \le 𝑥_2 \land𝑦_1 \ge 𝑦_2$ a linear order?
35989
Match a pattern only when NOT preceded or followed by another pattern
48480
Find two elements that don't have a gcd in a subring of Gaussian integers
70416
Coordinative ellipsis with not and unparellel structure
275
Two consecutive spaces
77390
Aligning equations while using cases in align environment
604
How to match numbers between X and Y with regexp?
135926
Either X(s) or Y(s) is/are
81096
Misplaced \noalign
9171
regex for matching something if it is not preceded by something else
156045
How do I grep for lines containing either of two words, but not both?
53421
What's the opposite of a cross product?
48904
Opposite of Alternatives
155679
If union of two theories is not consistent one of them implies a sentence which the other implies opposite of it
47217
regex negative look around with 2 adjacent matches
50485
Find files that contain a string and do not contain another
60090
Pattern to match L, but not L[_]