User lanskey - Mathematics Stack Exchange

lanskey

Member for 6 years, 8 months
Last seen this week

15 Answers

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5 votes

An intuitive idea about fundamental group of $\mathbb{RP}^2$

answered Aug 28, 2016 at 13:36

4 votes

Why is homomorphism defined as such?

answered Mar 20, 2018 at 2:10

4 votes

Why does $x^2 = 0$ give a repeated root of $x=0,0$ instead of a single root of $x=0$.

answered Mar 23, 2018 at 22:31

2 votes

Is there a formula to count the number of sets in a power set that have given pairs of elements?

answered Jan 19, 2020 at 7:26

2 votes

Accepted

Is the set W a subspace of R2. If so find a basis and dimension.

answered Apr 21, 2020 at 23:56

2 votes

Accepted

If $L:\mathbb{R}^n \rightarrow \mathbb{R}^m$ and $m<n$ linear trans. What does this tell about injectivity and surjectivity?

answered Mar 2, 2017 at 16:53

1 vote

How many five-card hands can be dealt from a standard deck of 52 playing cards

answered Dec 23, 2016 at 0:50

1 vote

Notation for bijection

answered Mar 22, 2018 at 13:48

1 vote

Accepted

2D symmetry group with 1 or more rotations (nontrivial) but exactly 1 reflection (nontrivial)

answered Nov 20, 2019 at 1:03

0 votes

Function of a vector with same derivative

answered Jan 19, 2020 at 8:16

0 votes

Probability of going only right in a random walk

answered Jun 16, 2018 at 8:44

0 votes

Accepted

Vectors of same length, perpendicularity

answered Mar 22, 2018 at 0:44

0 votes

Homeomorphism with many fixed points

answered May 30, 2017 at 4:58

0 votes

Accepted

Unit + nilpotent = a unit

answered Oct 8, 2016 at 2:10

0 votes

direction vector for the line in the $xy$-plane that passes the origin and makes an angle $\theta$ with the positive _x_-axis

answered Oct 8, 2016 at 2:39