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Kazark's user avatar
Kazark's user avatar
Kazark
  • Member for 12 years, 7 months
  • Last seen more than a week ago
37 votes
2 answers
25k views

Are one-by-one matrices equivalent to scalars?

13 votes
3 answers
10k views

How to write "let" in symbolic logic

8 votes
1 answer
3k views

Cross product of vectors as a determinant: valid matrix operation?

4 votes
3 answers
25k views

Symbolic predicate logic for "for all elements in a set except this one..."

4 votes
3 answers
1k views

What are the primitive notions of real analysis?

4 votes
1 answer
344 views

Is there a name for an algebraic structure with only "addition" and "truncated subtraction"?

3 votes
1 answer
1k views

Close packing of ellipsoids

2 votes
1 answer
172 views

Relationship between $|a_{i,j}|$ and $|\alpha^{|i-j|} a_{i,j}|$

2 votes
1 answer
2k views

Predicate logic notation: where to put the parentheses, etc.

1 vote
1 answer
418 views

Can a group be defined in terms of a relation on a set?

1 vote
1 answer
727 views

Is it legal to move the vertical bar in an augmented matrix?

1 vote
1 answer
75 views

What does semicommutative mean?