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James S. Cook's user avatar
James S. Cook's user avatar
James S. Cook's user avatar
James S. Cook
  • Member for 11 years, 10 months
  • Last seen this week
26 votes
6 answers
3k views

history of the double root solution of $ay''+by'+cy=0$

17 votes
1 answer
2k views

history of the contraction mapping technique

15 votes
2 answers
1k views

History of the matrix representation of complex numbers

10 votes
2 answers
2k views

Sturm Liouville with periodic boundary conditions

7 votes
1 answer
304 views

is this a wave equation?

6 votes
2 answers
436 views

Maps of primitive vectors and Conway's river, has anyone built this in SAGE?

6 votes
2 answers
13k views

how to find null space basis directly by matrix calculation

5 votes
2 answers
143 views

is there a better classification of a desirable algebra?

5 votes
2 answers
1k views

PDEs of higher order than three?

5 votes
2 answers
789 views

nonstandard example of smooth function which fails to be analytic on $\mathbb{R}$

5 votes
0 answers
462 views

how to uncouple and unreduce a system of first order PDEs

5 votes
1 answer
2k views

Concerning Carathéodory's criteria of differentiability and a proof that differentiable implies continuous

5 votes
1 answer
117 views

Sequence formed by quotient of sum and the product of odd squares is divergent: Why?

4 votes
1 answer
115 views

Infinitely many moons, or one ring to bring them all, a limit to bind it?

4 votes
0 answers
167 views

Generalized conjugation of polynomials with coefficients in an associative algebra

4 votes
2 answers
286 views

does this PDE have a name?

4 votes
3 answers
389 views

Mathematics of chemistry with focus on particular symmetries

4 votes
1 answer
195 views

What is up with limsup ? Is Wikipedia wrong about their smooth non-Analytic argument?

3 votes
1 answer
365 views

Using group action to study size of product of two subgroups

3 votes
1 answer
107 views

A Particular Quotient of Polynomials over Hyperbolic Numbers: is it Anything?

3 votes
1 answer
407 views

prime divisor propertyfor Hurwitz integers

3 votes
1 answer
2k views

C.H. Edwards "Advanced Calculus of Several Variables", Problem 3.5 of page 194

2 votes
2 answers
135 views

Coupled nonlinear PDE, how to find solution, is this a well-known problem?

2 votes
5 answers
5k views

how to define a circular helix in terms of the Frenet Frame

2 votes
2 answers
848 views

Notation for the set of zero divisors in a ring

2 votes
1 answer
100 views

What applications require the study of nonhomogenous partial differential equations

2 votes
2 answers
828 views

Stabilizer of orthogonal group acting on plane

2 votes
0 answers
157 views

Analog of Kronecker's Theorem for Polynomials over an Algebra

2 votes
1 answer
49 views

Technical Inequality needed to establish smooth but nowhere analytic function

2 votes
4 answers
800 views

How to construct Mobius transformation fixing real axis and mapping imaginary axis to circle