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28 votes
27 answers
3k views

Antisymmetry of a Matrix

37 votes
56 answers
9k views

Am I not good enough for you?

56 votes
68 answers
11k views

Am I a Fibonacci Number?

228 votes
338 answers
59k views

Is this number a prime?

39 votes
23 answers
5k views

Tut-tut-tut-tut-tut

50 votes
94 answers
7k views

Is it a pangram?

33 votes
40 answers
7k views

Numbers with Rotational Symmetry

21 votes
5 answers
604 views

Does there exist a synchronizing word?

27 votes
66 answers
8k views

Is string X a subsequence of string Y?

32 votes
13 answers
4k views

Have you heard of tralindromes?

19 votes
9 answers
1k views

Is This an Equivalence Relation?

42 votes
62 answers
9k views

Check whether letters of word are in alphabetical order

16 votes
17 answers
7k views

Determine if a relation is transitive

19 votes
14 answers
3k views

Is this graph a tree?

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