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Alex Jones's user avatar
Alex Jones's user avatar
Alex Jones
  • Member for 7 years, 10 months
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6 votes
1 answer
208 views

Matrix with $A_{ij} = a_i a_j$ for some vector $a\in\mathbb{R}^n$

4 votes
2 answers
83 views

Algebraic proof that $\binom{n+k-1}{k} = \sum\limits_{i=0}^k \binom{(n-1)+(k-i)-1}{k-i}$

3 votes
1 answer
627 views

Multiplying linear differential operators

3 votes
0 answers
81 views

What does it mean for a curve to "enclose" points on a sphere?

3 votes
0 answers
257 views

Theory of Autonomous Differential Equations in $\mathbb{R}^n$

2 votes
1 answer
143 views

Nonlinear ODE involving complex-valued function of a single real variable

2 votes
3 answers
194 views

What is the simplest, yet still rigorous, way to define $\text{d}x$?

2 votes
0 answers
276 views

Solving Bessel Differential Equation using Laplace Transforms: Where does $Y_0$ go?

1 vote
2 answers
120 views

When do roots of three quadratic polynomials multiply to 1?

1 vote
1 answer
133 views

Is there a word for $\left\lfloor\frac{x-1}{n}\right\rfloor + 1$?

1 vote
2 answers
568 views

What is the "sense" of an angle? (Hahn - Classical Complex Analysis)

1 vote
1 answer
546 views

String fixed on one end, weighted on the other?

1 vote
2 answers
393 views

Numerical approximation of non-unique ODE solution

1 vote
0 answers
113 views

Extension of Nonlinear Dynamics beyond ODE

0 votes
0 answers
63 views

Is the set of analytic functions equal to the set of polynomials?

0 votes
0 answers
37 views

Optimization with difference equation constraint