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user2901512
  • Member for 10 years, 5 months
  • Last seen more than a month ago
43 votes
7 answers
14k views

Can you have negative sets?

26 votes
1 answer
6k views

Predicate logic: How do you self-check the logical structure of your own arguments?

22 votes
9 answers
41k views

Implication in mathematics - How can A imply B when A is False? [duplicate]

16 votes
3 answers
9k views

What are the prerequisites for studying mathematical logic?

10 votes
3 answers
244 views

Why is the area of a circle not $2\pi r^2?$ (a fake proof) [duplicate]

8 votes
4 answers
1k views

Matrix inverses - Why are they derived the way they are?

5 votes
1 answer
320 views

What is a logical constant, exactly?

4 votes
2 answers
269 views

How do you find the value of an equation with nested fractions?

4 votes
3 answers
151 views

Why does $\sqrt{x} / y =\sqrt{x/y/y}$?

4 votes
1 answer
3k views

What is the structural hierarchy in mathematics?

3 votes
2 answers
6k views

Logic - What does a half T mean in logic?

3 votes
2 answers
15k views

What is $\text{log}(-x)$?

3 votes
3 answers
143 views

Difference between $(-x)^{1/n}$ and $-x^{1/n}$?

3 votes
4 answers
5k views

Why do they call it base 10?

3 votes
1 answer
6k views

Is there symbol to denote a combination and permutation?

2 votes
4 answers
4k views

Why is "$A$ unless $B$" equivalent to $A \lor B$?

2 votes
1 answer
191 views

When is the sine angle addition formula actually useful?

2 votes
2 answers
51 views

How would one go about solving a complicated polynomials? (Not necessarily complex one's, though)

2 votes
2 answers
2k views

How does the circumference of the top + bottom sides of a cylinder effect our calculations when working out the surface area?

2 votes
4 answers
436 views

Propositional Logic - Can you Derive $C \to A$ from $A$ alone, given the introduction rule?

2 votes
3 answers
3k views

How is it that 'if A then B' can be equivalent to 'A only if B'?

2 votes
1 answer
249 views

Is a function, in part, defined by it's domain?

1 vote
2 answers
3k views

Is there a symbol for always less than (or just always?)

1 vote
2 answers
2k views

Logic - What does ∴ mean in a truth table?

1 vote
1 answer
212 views

When is $0$ ever used in real life?

1 vote
2 answers
374 views

How do you calculate P(A/B), when event B occurred after event A?

1 vote
1 answer
4k views

How's it possible that for two or more shapes given the same area, that each shape can have distinct perimeters?

1 vote
1 answer
295 views

What is the term for a value that is directly dependent upon other values?

1 vote
0 answers
37 views

Logic - logical connective for (~ABC) + (A~BC) + (AB~C)?

1 vote
2 answers
584 views

How can an axiom ever be dependent