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Michael Burr's user avatar
Michael Burr's user avatar
Michael Burr's user avatar
Michael Burr
  • Member for 10 years, 10 months
  • Last seen this week
67 votes
Accepted

If $\frac{a}{b} = \frac{c}{d}$ why does $\frac{a+c}{b + d} = \frac{a}{b} = \frac{c}{d}$?

38 votes
Accepted

If a matrix commutes with a set of other matrices, what conclusions can be drawn?

30 votes
Accepted

p-Norm with p $\to$ infinity

29 votes
Accepted

What is significance of (.) in significant figures?

26 votes
Accepted

Sums of squares are closed under division

26 votes
Accepted

Is The Union of Intervals an Interval or not?

24 votes

Diagonalisability of 2×2 matrices with repeated eigenvalues

21 votes

If $3x^2 -2x+7=0$ then $\left(x-\frac{1}{3}\right)^2 =$?

19 votes

Intuition about the semidirect product of groups

19 votes
Accepted

Why do logarithmic curves not follow the general rules for transformations?

16 votes
Accepted

When are algebraic expressions equivalent?

16 votes

How many different ways can I get up a flight (of stairs) with 11 steps?

15 votes
Accepted

Does group inverse commute with multiplication for all groups?

15 votes

Why do we not have to prove definitions?

15 votes

Neutral element in monoid.

15 votes

Which of the following sets has the greatest cardinality?(Math subject GRE exam 0568 Q.61 )

14 votes
Accepted

If a group G is isomorphic to H, prove that Aut(G) is isomorphic to Aut(H)

13 votes

What is the chance that a rabbit won't fall off a table if you put it somewhere and it moves.

13 votes
Accepted

Injective, surjective or bijective?: $f: \mathbb{R}^{2} \rightarrow \mathbb{R}^{2}, (x,y) \mapsto (x+y,x+y^{2})$

13 votes
Accepted

What is the difference between a 2-dimensional plane in $R^3$ and $R^2$?

12 votes

Irrationality or Rationality of p+q given that pq=1

12 votes
Accepted

How many ways are there to choose 3 subsets $A,B,C$ of a set $\{1,2,3...n\}$ such that $ A \cap B \cap C = \emptyset $

12 votes
Accepted

Show that $(1+x)^{1-x}(1-x)^{1+x}<1$

12 votes
Accepted

A question about specific series that converge

11 votes

Proving that a function is odd

11 votes

Difference between magnitude of gradient vs directional derivative of gradient

11 votes
Accepted

The set theoretical reason for $f(\emptyset) = \emptyset$

11 votes
Accepted

How can the set of all graphs be the same size as its power set?

11 votes
Accepted

Why do we require quotient to be surjective?

11 votes
Accepted

Do both versions (invariant and primary) of the Fundamental Theorem for Finitely Generated Abelian Groups hold at the same time?

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