# Ian

Member Since February 8, 2009

Retired chap. Enjoys helping others with maths and physics.

## Recent Activity by Ian

### Asked:Is mass or energy destroyed in a black hole? A ...

Is mass or energy destroyed in a black hole? A. Never. B. Sometimes. C. Always.

### Asked:How do you solve a non homogeneous equation? y

how do you solve a non homogeneous equation? y" + 3y' = 28cosh (4x)

find the cosines of the interior angles of the triangle with vertices A(3,-1,1), B(4,1,0) and C(2,-3,0). find the vector component of AC orthogonal to AB.

### Asked:For p a prime, the poloynomial p[x]=x^p-Sum[x^j ...

For p a prime, the poloynomial p[x]=x^p-Sum[x^j,{j,0,p-1}] is irreducible over the rational numbers Q. Conjecture: p[x] is irreducible over Q for ALL p=1, 2, 3,... . Is this conjecture true.

### Asked:What is the least possible perimeter of a triangle ...

what is the least possible perimeter of a triangle whose sides have different positiv integers as its length?

### Asked:Is there theoretical evidence behind the basics ...

When I learned that the product of two imaginary numbers became the negative of the real-factor equivalent product, I did not get into why, but jsut found it to seem to make sense, without getting it ...

how do you identify factors from a polynomials

The gravitational force of attraction between Earth and the sun is 3.52 * 10^22 newtons. calculate the mass of the sun. show all work, including equation

## Contacts

Ian has no contacts.

## Compliments

OronD says:
"Ian You are doing a great job in Yedda. I see many of your math answers and you are always clear and accurate. Best personal regards, OronD. "
MackTheKnife says:
"I really like your answers. They are very clear and well thought out. "