2,739 reputation
2336
bio website ephorie.de
location Germany
age 44
visits member for 4 years, 6 months
seen yesterday

just an amateur fascinated by math


Jul
28
awarded  Yearling
Jun
27
comment Calculating 7^7^7^7^7^7^7 mod 100
wolframalpha.com/input/…
Jun
23
answered Portfolio which replicates given payoff
Jun
23
comment Portfolio which replicates given payoff
It is not considered good style to crosspost questions without informing people about that: quant.stackexchange.com/questions/8311/…
Jun
19
answered Probability problem
May
29
awarded  Notable Question
May
20
awarded  Good Question
Apr
10
answered Eigenvectors and Principal component
Apr
9
answered Rewriting the integral $\mathrm{erf}(x) = \frac{1}{\sqrt{\pi}} \int_{-x}^x e^{-t^2} dt.$
Apr
2
awarded  Civic Duty
Apr
1
comment Interpret the equation $17+28y+4x^2+4y^2=8x$ geometrically
+1: Good derivation
Apr
1
answered Interpret the equation $17+28y+4x^2+4y^2=8x$ geometrically
Mar
21
awarded  Citizen Patrol
Mar
13
revised Birthday paradox: Comparing the original version with the same-birthday-as-you version
added 221 characters in body
Mar
13
accepted Birthday paradox: Comparing the original version with the same-birthday-as-you version
Mar
12
comment Birthday paradox: Comparing the original version with the same-birthday-as-you version
Ok, I begin to see the idea. I think this comment is rather helpful, perhaps you want to include it into your original answer. Thank you again.
Mar
12
comment Birthday paradox: Comparing the original version with the same-birthday-as-you version
Thank you for your answer. I agree both are similar, yet in the case of the original paradox the falling factorial power in the numerator is growing considerable slower than $364$ to the $n$ in the other version. This is why you need $23$ in one case and $253$ in the other after all.
Mar
12
asked Birthday paradox: Comparing the original version with the same-birthday-as-you version
Mar
9
awarded  Notable Question
Mar
8
accepted How to prove that the limit is max(0,x)?