User mika

6 votes

2 answers

122 views

Sequence of equations

asked Sep 2, 2015 at 3:06

5 votes

2 answers

2k views

If a and b are in G and ab=ba, then we say a and b commute. Assuming a and b commute, prove:

asked Feb 8, 2015 at 23:49

5 votes

2 answers

1k views

Proof for spherical polar law of cosine

asked Mar 25, 2015 at 3:15

4 votes

6 answers

305 views

Determining if $973$ is prime

asked Oct 25, 2015 at 21:04

4 votes

2 answers

4k views

What are the differences between empty set, zero set and null set?

asked May 7, 2016 at 22:46

3 votes

5 answers

1k views

Prove or disprove by counterexample that in every group, every element has a square root

asked Feb 8, 2015 at 22:22

3 votes

1 answer

118 views

Method of reduction

asked Mar 28, 2015 at 0:34

3 votes

1 answer

940 views

In $\mathbb{Z}$, let m~n iff m-n is a multiple of 10.

asked Mar 31, 2015 at 1:04

3 votes

1 answer

554 views

Spherical triangle vertices to spherical coordinates

asked Feb 10, 2015 at 1:27

3 votes

1 answer

3k views

Finding angles in spherical triangle using law of cosines

asked Feb 11, 2015 at 20:37

3 votes

2 answers

1k views

If $a^k$=e where k is odd, then the order of a is odd

asked Mar 12, 2015 at 6:12

3 votes

1 answer

868 views

Disjoint cycles vs product of cycles

asked Mar 12, 2015 at 20:15

2 votes

0 answers

33 views

products of cyclic groups

asked Mar 14, 2015 at 23:34

2 votes

1 answer

2k views

Find the hyperbolic distance in the upper hyperbolic plane

asked Apr 6, 2015 at 21:07

2 votes

2 answers

2k views

How to translate a vector and then rotate by a point

asked Apr 11, 2015 at 4:17

2 votes

1 answer

705 views

Finding the length of the sides, the measure of the angles and area of spherical triangles?

asked Feb 3, 2015 at 4:10

2 votes

3 answers

4k views

Find the solution of the given initial value problem (differential equations)

asked Feb 8, 2015 at 5:41

2 votes

2 answers

137 views

Determining the population mean

asked Dec 5, 2015 at 17:27

2 votes

1 answer

2k views

Express the feasible solution (3,1) as a convex combination of extreme points

asked Mar 11, 2016 at 16:43

1 vote

4 answers

2k views

Finding ratio of cevian lines

asked Jul 12, 2016 at 0:56

1 vote

2 answers

703 views

Why do we use height to calculate the area of a triangle?

asked Nov 26, 2015 at 1:51

1 vote

0 answers

61 views

Let $I$ be an inversion and let $C$ be a circle such that $I(C)$ is also a circle. When do $C$ and $I(C)$ have equal radii?

asked May 19, 2015 at 23:49

0 votes

2 answers

90 views

Finding a number

asked Oct 25, 2015 at 21:12

0 votes

1 answer

53 views

How long are $AO$ and $OC$?

asked Nov 10, 2015 at 2:38

Stack Exchange Network

24 Questions

Sequence of equations

If a and b are in G and ab=ba, then we say a and b commute. Assuming a and b commute, prove:

Proof for spherical polar law of cosine

Determining if $973$ is prime

What are the differences between empty set, zero set and null set?

Prove or disprove by counterexample that in every group, every element has a square root

Method of reduction

In $\mathbb{Z}$, let m~n iff m-n is a multiple of 10.

Spherical triangle vertices to spherical coordinates

Finding angles in spherical triangle using law of cosines

If $a^k$=e where k is odd, then the order of a is odd

Disjoint cycles vs product of cycles

products of cyclic groups

Find the hyperbolic distance in the upper hyperbolic plane

How to translate a vector and then rotate by a point

Finding the length of the sides, the measure of the angles and area of spherical triangles?

Find the solution of the given initial value problem (differential equations)

Determining the population mean

Express the feasible solution (3,1) as a convex combination of extreme points

Finding ratio of cevian lines

Why do we use height to calculate the area of a triangle?

Let $I$ be an inversion and let $C$ be a circle such that $I(C)$ is also a circle. When do $C$ and $I(C)$ have equal radii?

Finding a number

How long are $AO$ and $OC$?