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carmichael561
  • Member for 8 years, 2 months
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116 votes
Accepted

A lily pad doubles in area every second. After one minute, it fills the pond. How long would it take to quarter fill the pond ?

53 votes
Accepted

A dice is rolled until a $6$ occurs. What is the probability that the sum including the $6$ is even?

46 votes
Accepted

Probability brain teaser with infinite loop

25 votes

None of $3,5,7$ can divide $r^4+1$

22 votes
Accepted

Are abelian subgroups normal?

22 votes

Show that this matrix is singular

20 votes
Accepted

What is the difference between an adapted process and a predictable process?

20 votes
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Is saying a set is nowhere dense the same as saying a set has no interior?

19 votes

Probability of being poisoned

19 votes
Accepted

Totally real Galois extension of given degree

19 votes
Accepted

What's the probability of getting 1000 heads in a row?

18 votes

Prove that $A$ cannot be invertible if $A^2=0$

18 votes

Trying to show that $\ln(x) = \lim_{n\to\infty} n(x^{1/n} -1)$

17 votes
Accepted

Why is the probability of $\emptyset$ equal to 0?

17 votes
Accepted

Why are singular values always non-negative?

17 votes

$A$ and $A^2$ have same characteristic polynomial

16 votes

Decide whether the series ${\sum_{n=1}^{\infty} \frac{1+5^n}{1+6^n}}$ converges or diverges

16 votes

Does any given integer only occur in one primitive Pythagorean triple?

16 votes

does a rectangular matrix have an inverse?

16 votes

Determining If a Function is a Linear Transformation

15 votes
Accepted

Can we determine if a complex number is greater than another?

15 votes
Accepted

Lebesgue's Differentiation Theorem for Continuous Functions

15 votes
Accepted

Proving that a group homomorphism preserves the identity element

15 votes
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What does $\sim$ mean in math and statistics?

14 votes

If $A$ and $B$ are $n\times n$ complex matrices , then $AB-BA=I$ is impossible.

14 votes
Accepted

What is the difference between Rudin's *Principles of Mathematical Analysis* and *Real and Complex Analysis* books?

14 votes
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Is $\sum (n^{\frac{1}{n}}-1)^n$ divergent or convergent?

14 votes

Factor 43361 knowing $\phi(43361)$

13 votes
Accepted

Why would the projection function open and not closed?

13 votes
Accepted

$\sigma$-finite versus Locally Finite Measures

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