Daniel R. Collins's user avatar
Daniel R. Collins's user avatar
Daniel R. Collins's user avatar
Daniel R. Collins
  • Member for 8 years, 7 months
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95 votes
Accepted

Can I think of Algebra like this?

86 votes

What are some counter-intuitive results in mathematics that involve only finite objects?

66 votes

Show that $(2,0,4) , (4,1,-1) , (6,7,7)$ form a right triangle

35 votes

Counterintuitive examples in probability

25 votes

Do we have negative prime numbers?

23 votes

What is symmetric about set symmetric difference?

20 votes

What is meant, exactly, by nonrepeating when talking about irrational numbers?

19 votes

Why can't calculus be done on the rational numbers?

18 votes

Is there such thing as a "smallest positive number that isn't zero"?

15 votes

Is it technically incorrect to write proofs forward?

14 votes

What equation produces this curve?

13 votes

Please help me spot the error in my "proof" that the sum of two irrational numbers must be irrational

13 votes

How do we know that common rearrangement proofs of the Pythagorean theorem work for any right triangle?

11 votes

How can a "proper" function have a vertical slope?

11 votes

If a function is undefined at a point, is it also discontinuous at that point?

10 votes

What are some things we can prove they must exist, but have no idea what they are?

10 votes

How many ways can 2 person sit in 4 empty chairs?

10 votes
Accepted

What is the right way to calculate a power?

10 votes

What's the point in being a "skeptical" learner

8 votes

Why can't I prove summation identities without guessing?

8 votes

Applications of complex numbers to solve non-complex problems

8 votes

Is the binomial theorem actually more efficient than just distributing

7 votes

Systems of linear equations: Why does no one plug back in?

7 votes

Good "history of mathematical ideas" book?

6 votes

Can you use both sides of an equation to prove equality?

6 votes

Why is negative times negative = positive?

6 votes

Why does one have to check if axioms are true?

6 votes

Can you make a sphere out of a plane?

6 votes
Accepted

N-queen examples - Discrete Mathematics, Kenneth Rosen (pg-33)

5 votes
Accepted

Can an isolated point be an interior point?

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