Mastering Series Solutions of ODE's

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Discussion Overview

The discussion revolves around the challenges participants face in mastering series solutions of ordinary differential equations (ODEs), particularly around ordinary and singular points. Participants express their struggles with understanding the concepts and applying them effectively in problem-solving contexts.

Discussion Character

  • Exploratory
  • Homework-related
  • Conceptual clarification

Main Points Raised

  • One participant expresses a fundamental misunderstanding of series solutions and requests a clearer explanation of the concepts involved.
  • Another participant shares a metaphor about learning through practice, comparing it to improving a tennis backhand, suggesting that persistence is key to mastering the material.
  • A participant notes the frustration of running out of practice problems and failing to solve any, indicating that this has hindered their understanding.
  • One suggestion involves starting with simpler problems and gradually increasing complexity, using specific examples of ODEs to illustrate this approach.
  • Participants discuss the importance of working through examples and modifying them slightly to build confidence and understanding.

Areas of Agreement / Disagreement

Participants generally agree on the importance of practice and building understanding incrementally, but there is no consensus on specific methods or solutions to the challenges faced in mastering series solutions.

Contextual Notes

Some participants mention the need for worked examples and express uncertainty about how to approach problems effectively. There is a recognition that different starting points may be necessary for different learners.

Who May Find This Useful

This discussion may be useful for students struggling with series solutions of ODEs, educators looking for insights into common student challenges, and anyone interested in problem-solving strategies in mathematical contexts.

Angry Citizen
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So.. I need.. 'help'. Meh. It seems I just don't understand what's going on with series solutions. I thought I did, but I just don't. It seems to be a fundamental misunderstanding of what the book and professor are trying to convey. Could someone please give me a rundown on what's going on and how to do them, both around ordinary points and singular points? I wish I could be more specific as far as questions, but I just don't know why I can't do them.

Thanks.
 
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Angry Citizen said:
but I just don't know why I can't do them.

Thanks.

Know what, I use to play tennis. But my back-hand use to suck. So for a while I just hit it solely back-hand. Yeah, it went all over the place . . . for a little while. But then something happened. I started getting good at it and before long it didn't suck no more. Good cooks try again when they mess up a recipie and pretty soon they cookin' up something good. How they get so good? They're willing to try and fail and then try some more. So get out there, knock that ball all over the place and pretty soon you'll be cookin' up something nice too.
 
What a statement.
 
Problem is, I ran out of problems to practice with in my book - and I succeeded in solving precisely zero. I know practice makes perfect, but when you're failing miserably at every single one, you realize that no amount of problems are going to make any sense out of the material.

In a sense, it's like if you were trying to practice backhanding tennis balls ... if they were thrown from two states away.
 
A valuable lesson in the art of problem solving is when you run into problems with a problem, put it on the back-burner and work on something simpler and then start building back up to the original problem. So surely your book has some worked examples. Go over those and then change one only slightly. Say one in the book is:

y''+(2x+3)y'+4y=0

Ok, get that one straight then change it slightly like:

y''+(4x+3)y'+4y=0

Now do that on on your own. Bet you could if you got the first one straight.

Now, little more complex:

y''+(4x^2+3)y'+4y=0

Do that one. Same dif with the singular ones like:

(x^2+4x+2)y''-(2x+4)y'+3x^2y=0

First drop everything but just one x:

xy''+y'+y=0

Or if that one is too hard, move it over:

y''+y'+xy=0

Too hard?

y''+xy=0

Keep dropping it down until you get it, then start building it back up.
 

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