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seen Sep 5 at 11:53

Oct
18
comment Recursion with non-equal exponents
What kind of functions on which domain are you looking for? Do you have an example? Are the functions continuous? Or functions on the natural numbers ? Are there initial conditions?`Are you looking for asymptotics?
Oct
18
comment Recursion with non-equal exponents
What is $P_d$ ?
Oct
18
answered Convert Hexadecimal to Binary number
Oct
18
comment Combinatorial interpretation of the Prime Number Theorem?
@r.e.s. Please let it stand here. The answer warns eveyone about the flaw, but it is still an interesting line of reasoning.
Oct
17
revised Two Dirichlet's series related to the Divisor Summatory Function and to the Riemann's zeta-function, $\zeta(s)$
edited tags
Oct
17
comment counting tuples with restricted condition
@ougao Your example now is the coefficient of $q^5$ in $q^4(1-q^5)/(1-q)$ which is the coefficient of $q$ in $1+q+q^2+q^3+q^4$.
Oct
17
revised counting tuples with restricted condition
added 289 characters in body
Oct
16
comment Trapezoid's area
@Bring Calculate the third non-alpha angle and then apply the formula.
Oct
16
comment How is this probability found (project euler #121)?
@narik No, this is $\frac 12 \cdot \frac 13 \cdot \frac 14 \cdot \frac 45$.
Oct
16
revised How is this probability found (project euler #121)?
added link, explained origin more precisely
Oct
16
answered How is this probability found (project euler #121)?
Oct
16
answered Proof of $\sum_{0 \le k \le t} {t-k \choose r}{k \choose s}={t+1 \choose r+s+1}$?
Oct
16
revised counting tuples with restricted condition
added 206 characters in body
Oct
16
answered counting tuples with restricted condition
Oct
15
answered Order of finite fields is $p^n$
Oct
15
answered A resource of exercises about induction and combinatorics
Oct
15
comment Copy LaTex equations from Mathematica to Word directly?
Please consider supporting the mathematica proposal area51.stackexchange.com/proposals/15787/mathematica Unfortunately, I cannot help you with your question because I don't know anything about Word equation editor.
Oct
15
answered integral equation
Oct
14
comment Do other non-native english speakers have trouble solving certain kinds of problems?
I don't have a problem mixing my languages, although note-taking in mixed languages can lead to a question for the speaker in the wrong language. I still do arithmetic in my native language in my head and most of my colleagues from different countries do so. I suggest to use "permutation" inside a reasoning in your native language without any scruples.
Oct
14
comment Having problem in finding values of variables
Yes, this is to be expected to happen often when you have actually just one equation for two variables.