Is there an encyclopedia of DE that accepts solutions?

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    Differential equations
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Discussion Overview

The discussion revolves around the search for a comprehensive resource or encyclopedia that lists solved differential equations (DE) and their solutions. Participants express interest in both the existence of such a resource and the methods used to derive solutions, with a focus on analytic solutions and specific types of differential equations.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • Some participants inquire about the existence of an encyclopedia for solved differential equations, similar to the Encyclopedia of Integer Sequences.
  • There is skepticism regarding the existence of a comprehensive list of all solved differential equations.
  • Participants discuss the rarity of analytic solutions for differential equations, suggesting that only a few DEs have such solutions.
  • A website, eqworld, is mentioned as a valuable resource for general solutions to common differential equations, including ordinary and partial differential equations.
  • Some participants reference books by Kamke and Murphy, noting their value as databases but also their dated nature compared to recent advancements in the field.
  • There is mention of advanced topics such as differential Galois theory, Lie's symmetry analysis, and Darboux methods, indicating ongoing developments in the classification and analysis of differential equations.
  • Participants express interest in the current state of research regarding Galois theory applied to differential equations, with some uncertainty about the completeness of these approaches.
  • Discussion includes the algorithmic approach to differential equations and its educational benefits, along with references to specific works and authors in the field.
  • There is a question about the applicability of these methods to quantum mechanics equations, specifically the Schrödinger equation.

Areas of Agreement / Disagreement

Participants generally do not agree on the existence of a comprehensive encyclopedia for solved differential equations, with some expressing doubt. There are multiple competing views regarding the availability and completeness of resources, as well as the applicability of certain methods in different contexts.

Contextual Notes

Some limitations include the lack of consensus on the completeness of mathematical approaches and the dependence on specific definitions and types of differential equations. The discussion reflects varying levels of familiarity with advanced topics and ongoing research in the field.

Who May Find This Useful

Readers interested in differential equations, mathematical methods, and current research trends in the field may find this discussion relevant.

jonjacson
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DE= Differential equations.

There is an Encyclopedia of Integer Sequences for example, but I am not able to find the equivalent for DE.

I would like to find a list with all the differential equations that have been solved up to date.

A website or any other source would be interesting. If the source contains the methods to get their solutions would be perfect.

Thanks for your time.
 
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jonjacson said:
DE= Differential equations.

There is an Encyclopedia of Integer Sequences for example, but I am not able to find the equivalent for DE.

I would like to find a list with all the differential equations that have been solved up to date.
I doubt very much that such a list exists.
jonjacson said:
A website or any other source would be interesting. If the source contains the methods to get their solutions would be perfect.

Thanks for your time.
 
Mark44 said:
I doubt very much that such a list exists.

Maybe if we talk about a specific type of differential equations?
 
You mean analytic solutions? There are only very few DE's with an analytic solution.
 
micromass said:
You mean analytic solutions? There are only very few DE's with an analytic solution.

Yes, I mean that. Sorry for not expressing it properly maybe.
 
Here's a website that has general solutions to a number of common differential equations:

http://eqworld.ipmnet.ru/en/solutions/ode.htm

The page I linked to focuses on ordinary differential equations, but the menu on the left side of the page has links to systems of equations as well as PDEs.
 
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That is what I was looking for. I will purchase those books.

Hopefully they will show the methods employed to find the solutions, I mean methods like the Euler method etc.
 
eqworld is the best online source. I have the books of Kamke and Murphy, and although they contain a lot of de's with solutions and solution strategies, they are a bit dated. You should mainly use these as a database, not as study material. Much has happened since those books appeared: differential Galois theory, Lie's symmetry analysis, Darboux methods, to name a few. We know more about classification, relationships between DE's, equivalence transformations, etc.
 
bigfooted said:
eqworld is the best online source. I have the books of Kamke and Murphy, and although they contain a lot of de's with solutions and solution strategies, they are a bit dated. You should mainly use these as a database, not as study material. Much has happened since those books appeared: differential Galois theory, Lie's symmetry analysis, Darboux methods, to name a few. We know more about classification, relationships between DE's, equivalence transformations, etc.
I have the book "ALgorithmic Lie Theory" that talks about another approach to transfering the Galois method to differential equations that was started by Picard and Vessiot. Do you know what is the "state of affairs" on this topic?

Apparently there are several approaches to apply Galois theory to differential equations, I don't how if that has been completed succesfully and completely.
 
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I also have the book, but I am still in chapter 2. I think it is pretty much the state of affairs regarding Janet bases. I like the algorithmic approach, you can program the algorithm yourself which helps in understanding the method.
There are also people like van der Put and Singer who focus more on linear differential equations, their book is also on my To Do list. On my list is also the thesis of Aistleitner, which gives a nice overview and comparison of some other differential elimination methods
http://www.risc.jku.at/publications/download/risc_4229/master.pdf
I don't have a complete overview of the current state of affairs, this is all sunday-afternoon math for me, and I am happy to hear of other seminal 'must-read' works.

I don't know when mathematicians consider a mathematical approach to be complete. At least a lot of progress has been made the last 25 years and we can systematically find properties of large classes of differential equations (symmetries, invariant solutions, first integrals).
 
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  • #11
bigfooted said:
I also have the book, but I am still in chapter 2. I think it is pretty much the state of affairs regarding Janet bases. I like the algorithmic approach, you can program the algorithm yourself which helps in understanding the method.
There are also people like van der Put and Singer who focus more on linear differential equations, their book is also on my To Do list. On my list is also the thesis of Aistleitner, which gives a nice overview and comparison of some other differential elimination methods
http://www.risc.jku.at/publications/download/risc_4229/master.pdf
I don't have a complete overview of the current state of affairs, this is all sunday-afternoon math for me, and I am happy to hear of other seminal 'must-read' works.

I don't know when mathematicians consider a mathematical approach to be complete. At least a lot of progress has been made the last 25 years and we can systematically find properties of large classes of differential equations (symmetries, invariant solutions, first integrals).

Very interesting.

Do you know if these methods are useful with quantum mechanics equations (Schrödinger)?
 
  • #12
I think Lie groups are used in quantum mechanics, but I don't know a lot about it.
 
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