User Itsnhantransitive

5 votes

3 answers

6k views

Proving complex series $1 + \cos\theta + \cos2\theta +... + \cos n\theta $

asked Jan 24, 2018 at 0:39

4 votes

2 answers

2k views

Chess combinatoric problem

asked Sep 14, 2017 at 1:41

4 votes

1 answer

491 views

Continuous dynamical system bifurcation diagram help!$\dot{x} = x [r -(1 - x^2)] [r - (2x^3 - 2x)]$

asked Oct 25, 2017 at 2:49

3 votes

2 answers

936 views

Combinatorics on rooks on chess board

asked Sep 14, 2017 at 18:22

3 votes

3 answers

669 views

Inversion related problem

asked Sep 24, 2017 at 3:19

3 votes

1 answer

199 views

Finding eigenvalues for a $4\times4$ matrix

asked Apr 23, 2017 at 23:04

3 votes

3 answers

98 views

Need explanation on a binomial theorem related problem for $\sum_{k=0}^{n} \binom{n}{k}k$

asked Oct 6, 2017 at 2:28

3 votes

2 answers

275 views

Sketching a discrete-time dynamical system with a repelling period-2 orbit

asked Oct 9, 2017 at 4:46

3 votes

0 answers

67 views

Check solutions for this integral $\oint_\Gamma \frac{3z -1}{(z+2i)^3 z^2} dz$

asked Mar 28, 2018 at 14:44

3 votes

1 answer

259 views

Hockey game score probability question

asked May 1, 2018 at 17:34

3 votes

3 answers

233 views

Proving If $k \le \left\lfloor \frac{n}{2} \right\rfloor$ then $\binom{n}{k-1} < \binom{n}{k}$

asked Oct 11, 2018 at 18:41

3 votes

1 answer

304 views

Permutation of the word MATTER

asked Oct 15, 2018 at 19:10

3 votes

1 answer

218 views

Laurent series for $\frac{1}{z(z+3)(z-1)^2}$

asked May 4, 2018 at 14:10

2 votes

1 answer

1k views

Carousel seating problem including girls and boys

asked Oct 24, 2018 at 1:07

2 votes

1 answer

2k views

Joukowski mapping a circle onto an ellipse problem

asked Feb 15, 2018 at 15:57

2 votes

2 answers

174 views

Superattracting period-n orbits in the Mandelbrot set

asked Dec 14, 2017 at 12:32

2 votes

1 answer

71 views

Question regarding the proof of $\sum_{k=0}^{n} (-1)^k \binom{n}{k}^{2}$

asked Oct 4, 2017 at 6:12

2 votes

2 answers

9k views

Show that if $f$ is analytic in a domain $D$ and $|f(z)|$ is constant in $D$, then the function $f(z)$ is constant in $D$

asked Feb 14, 2018 at 23:06

2 votes

2 answers

726 views

Prove that there exists no function $F(z)$ analytic is in the annulus $D: 1 < |z| < 2 $ such that $F'(z) = \frac{1}{z}$ for all $z$ in $D$.

asked Feb 27, 2018 at 21:44

2 votes

1 answer

4k views

Linear transformation problem M2x2 to P2

asked Apr 24, 2017 at 2:51

2 votes

1 answer

312 views

Finding eigenvalues and basis for linear transformation $T: P_{100} \to P_{100}$

asked Apr 25, 2017 at 23:18

2 votes

1 answer

37 views

Proof concerning the Riemann integral

asked May 1, 2017 at 15:51

2 votes

2 answers

336 views

Binomial theorem relating proof

asked Oct 3, 2017 at 19:22

1 vote

1 answer

521 views

Recurrence relation $a_{n} = 2n(a_{n-1} + 3^n(n!)$, $ a_{0} = 1$

asked Nov 10, 2017 at 18:08

1 vote

2 answers

664 views

Hopf bifurcation question for the system $\dot{x} = y + \mu x$ and $\dot{y} = -x + \mu y - x^2y$

asked Nov 13, 2017 at 17:38

1 vote

3 answers

3k views

Street combinatorics problem

asked Sep 14, 2017 at 2:50

1 vote

3 answers

62 views

Diagonalizablity of a transformation from ${P_{10}} \to {P_{10}}$

asked May 5, 2017 at 2:06

1 vote

2 answers

118 views

Birthday problem involving overlapping birthday dates

asked Sep 24, 2017 at 16:17

1 vote

3 answers

232 views

Convergence of infinite series for $\sum {{a_n}} $ and $\sum {{b_n}}$

asked May 1, 2017 at 16:18

1 vote

1 answer

274 views

Mixed distribution problem where $F(x) = aF_d(x) + (1-a)F_c(x)$

asked May 3, 2017 at 3:17

Stack Exchange Network

93 Questions

Proving complex series $1 + \cos\theta + \cos2\theta +... + \cos n\theta $

Chess combinatoric problem

Continuous dynamical system bifurcation diagram help!$\dot{x} = x [r -(1 - x^2)] [r - (2x^3 - 2x)]$

Combinatorics on rooks on chess board

Inversion related problem

Finding eigenvalues for a $4\times4$ matrix

Need explanation on a binomial theorem related problem for $\sum_{k=0}^{n} \binom{n}{k}k$

Sketching a discrete-time dynamical system with a repelling period-2 orbit

Check solutions for this integral $\oint_\Gamma \frac{3z -1}{(z+2i)^3 z^2} dz$

Hockey game score probability question

Proving If $k \le \left\lfloor \frac{n}{2} \right\rfloor$ then $\binom{n}{k-1} < \binom{n}{k}$

Permutation of the word MATTER

Laurent series for $\frac{1}{z(z+3)(z-1)^2}$

Carousel seating problem including girls and boys

Joukowski mapping a circle onto an ellipse problem

Superattracting period-n orbits in the Mandelbrot set

Question regarding the proof of $\sum_{k=0}^{n} (-1)^k \binom{n}{k}^{2}$

Show that if $f$ is analytic in a domain $D$ and $|f(z)|$ is constant in $D$, then the function $f(z)$ is constant in $D$

Prove that there exists no function $F(z)$ analytic is in the annulus $D: 1 < |z| < 2 $ such that $F'(z) = \frac{1}{z}$ for all $z$ in $D$.

Linear transformation problem M2x2 to P2

Finding eigenvalues and basis for linear transformation $T: P_{100} \to P_{100}$

Proof concerning the Riemann integral

Binomial theorem relating proof

Recurrence relation $a_{n} = 2n(a_{n-1} + 3^n(n!)$, $ a_{0} = 1$

Hopf bifurcation question for the system $\dot{x} = y + \mu x$ and $\dot{y} = -x + \mu y - x^2y$

Street combinatorics problem

Diagonalizablity of a transformation from ${P_{10}} \to {P_{10}}$

Birthday problem involving overlapping birthday dates

Convergence of infinite series for $\sum {{a_n}} $ and $\sum {{b_n}}$

Mixed distribution problem where $F(x) = aF_d(x) + (1-a)F_c(x)$