# rpn

1. ### interpretation of different programs on rpn financial calculator

I am using rpn financial calculator.Its website is RpnCalc Financial Please go to website and click on 'programming'.Check various programs therein. For example 1)annual bond 2)depreciation 3)day- basis bond. 4)Leasing 5)rent or buy 6)full part 7) Effective rate etc. If anyone...
2. ### RP^n, S^1 and homotopies...

Hi, I'm taking first steps in algebraic topology and I became stuck at the problem: "Prove that any map of the real projective space RP^n for n>=2 to S^1 is null homotopic" ("Algebraic topology" by E. Spanier. Ex.4 chapter2) I've already proved that any two maps from a simply connected locally...
3. ### Prove that the n-dimensional real projective space RP^n is compact

Prove that the n-dimensional real projective space \mathbb{RP}^n is compact. I wouldn't know where to start. Further, I have another question. I need to prove that R with its cofinite topology is compact and sequentially compact. Compact seems easy, I did it like this: Let (U_n) be...