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Jul
19
comment Example of a homeomorphism on the real line?
what do you mean "appropriate"? homeomorphism also need to be bijective, and don't necessarily need to be on compact sets. Think about 1/x
Jun
24
awarded  Good Answer
May
30
comment How to Find a Probability with Monte Carlo Simulation
since there are certainly many ways of creating a solution to the problem and i'm sure there are R packages that could help as well, it would be helpful to explain your thought process
May
30
comment How to Find a Probability with Monte Carlo Simulation
well can you edit your question to update your approach to the problem at least? maybe write your math answer in pseudo-code and someone can help translate it (although this isn't site isn't really geared towards programming and there are wonderful resources on the web for learning R)
May
30
comment How to Find a Probability with Monte Carlo Simulation
What are you having problems with, the math or the coding?
May
18
awarded  Popular Question
Mar
22
revised Can't Get Present Value Answer?
added 21 characters in body
Mar
22
answered Can't Get Present Value Answer?
Mar
22
comment Can't Get Present Value Answer?
My only other pieces of advice are to make sure you are using the correct interest rate, and double checking your formula. 8% compounded quarterly is 2% effective quarterly, and I've never seen present value described as you have laid it out (see e.g. wikipedia)
Mar
22
comment Can't Get Present Value Answer?
Well then, it certainly seems as if the issue is that you are using the formula as directed instead of understanding how and why such a formula exists. I suggest writing down a cash flow diagram, the associated present value of the payments, and realizing you're summing a geometric series.
Mar
22
comment Can't Get Present Value Answer?
Can you tell us what you did 1 or 2 of those 20 times? If you understand how an annuity is calculated, the solution is immediate, this isn't a tricky problem.
Mar
22
revised Can't Get Present Value Answer?
corrected tags
Mar
1
comment Properties of a transpose
I'd use induction, and the property $(AB)^T = B^T A^T$
Mar
1
comment Properties of a transpose
You don't know A is invertible, so how will the property you listed help you?
Feb
28
comment why and when t0 use norm instead of abs and vice versa
the absolute value has a specific definition. the norm can have multiple definitions, depending on context. the absolute value is a norm, but a norm is not necessarily an absolute value. You might even see people "abuse notation" and use the absolute value bars in place of norm bars.
Feb
28
comment Significance of orthonormal basis in wavelet analysis
mathoverflow.net/questions/42040/…
Feb
22
comment YTM and YTC. how do you discount the coupon rate?
you discount using the yield rate
Feb
20
comment Bad notation in Fulton's algebraic curves book
Seems to me like this is defined on Page 3 (it's the derivative). It's also listed in the "Notation"/Table of Symbols on page 117.
Feb
12
comment House loses value each year. How long will it take for the house to be worth $150000
that looks right to me... can you solve it from there?
Feb
12
comment House loses value each year. How long will it take for the house to be worth $150000
Have you tried setting up an equation to solve? Do you know about logarithms?