4,654 reputation
11020
bio website jpmccarthymaths.com
location University College Cork, Ireland
age 29
visits member for 2 years, 9 months
seen 56 mins ago

An assistant lecturer at the Cork Institute of Technology. I am also a PhD student of mathematics at University College Cork, Ireland. I hold a BSc and an MSc from UCC. A recent cv, (June 2014) may be found here.

https://jpmccarthymaths.files.wordpress.com/2010/07/resume.pdf


10h
revised A second order differential equation
added 8 characters in body
2d
comment Paradox in connection with definition of limit points and order limit theorem?
Why did you edit out the useful link/duplicate?
Aug
27
comment Solution of a linear system equation when $A^2=\mathcal I_n$
Rama the question doesn't need the answers for it to be answered! Answer my question.
Aug
27
comment Solution of a linear system equation when $A^2=\mathcal I_n$
Rama you didn't answer my question.
Aug
27
comment Solution of a linear system equation when $A^2=\mathcal I_n$
$\mathbf{x}=A\mathbf{y}$... how did I get this?
Aug
21
comment how to prove : there are an infinite number of points on the circle
There is a bijection from a circle to $[0,2\pi)$.
Jul
23
awarded  Good Answer
Jul
18
comment How to get a vector from its length and angle
You see your picture above. Drop a vertical from the 'tip". Now the length of this vertical is the $y$-coordinate. The length of the vector is three as you said. Now, how do you find the sine if an angle?
Jul
18
comment How to get a vector from its length and angle
$x$ and $y$ are what you are looking for - the $x$ and $y$ coordinates.
Jul
18
revised How to get a vector from its length and angle
added 20 characters in body
Jul
18
comment How $+\infty$ is identity element for min operation
Presumably because if you take any numerical input $n$ and ask for $\min(n,\infty)$ you get $n$.
Jul
18
answered How to get a vector from its length and angle
Jul
17
comment Lagrange Interpolation Theorem?
@Ian To be honest as far as I am concerned that goes without saying. Thanks for your help.
Jul
17
comment Lagrange Interpolation Theorem?
@Ian Would I be correct is saying there is a unique polynomial of degree less than or equal to $n$ through $n+1$ points?
Jul
17
revised Lagrange Interpolation Theorem?
deleted 13 characters in body
Jul
17
answered Lagrange Interpolation Theorem?
Jul
16
comment Simplify expression $(x\sqrt{y}- y\sqrt{x})/(x\sqrt{y} + y\sqrt{x})$
...can you not do a little more if you take $xy\neq0$?
Jul
6
awarded  Good Answer
Jul
2
awarded  Curious
Jul
2
comment What is the definition of $G/R$ (the classes of all equivalence classes in G) symbolically?
$\{\bar{a}:a\in G\}$... well I don't really know what you mean by "symbolic explanation".