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2d
answered Indexes of prime Fibonacci numbers
2d
answered A simple expression to map $\mathbb N^*$ bijectively to $\mathbb N$
Jul
29
awarded  Nice Answer
Jul
28
comment Find $\lim_\limits{x\to 1}{\frac{f(x)-2\cdot x^2}{x-1}}$
@Caran-d'Ache Ty, fixed
Jul
28
revised Find $\lim_\limits{x\to 1}{\frac{f(x)-2\cdot x^2}{x-1}}$
deleted 2 characters in body
Jul
28
answered Find $\lim_\limits{x\to 1}{\frac{f(x)-2\cdot x^2}{x-1}}$
Jul
27
comment Find the limit of this sequence
@MichaelGaluza Since $x_0$ is not given it is probably the second one.
Jul
27
answered Find the limit of this sequence
Jul
26
answered Difference between the two ways of finding average winning rate over a period of time
Jul
26
answered Is there a matrix with real entries such that $A \ne I_2$ but $A^3 = I_2$.
Jul
26
comment Find $\lim_{n \to \infty} n[(1+\frac{1}{n})^n - e]$
You derivated wrong $(1+x)^{\frac{1}{x}}$. Use logarithmic derivation.
Jul
26
comment I need help proving the base case for a mathematical induction proof
@Nan Ty, fixed it.
Jul
26
revised I need help proving the base case for a mathematical induction proof
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Jul
26
answered I need help proving the base case for a mathematical induction proof
Jul
26
comment Triangular number method - Hilbert's hotel
@man_in_green_shirt If you plug $c=n=1$ in the formula you don't get 3. The labeling of the triangular numbers in the problem is either non-standard or wrong...
Jul
26
revised Triangular number method - Hilbert's hotel
added 384 characters in body
Jul
26
comment Triangular number method - Hilbert's hotel
@man_in_green_shirt $((c+n)^2+c+n)/2$ is the $c+n$ triangular number, not the $c+n-1$...
Jul
26
answered Triangular number method - Hilbert's hotel
Jul
25
awarded  Enlightened
Jul
25
awarded  Nice Answer