## errata for the book

A Partial Differential Equation Approach

### errata for the book

hello,

is there an errata of the book somewhere?

I found this by a reader:

http://www.amazon.com/Financial-Enginee ... B000TP9GD8

Could the author opinate?

regards
hichmoul

Posts: 4
Joined: Wed Feb 11, 2009 1:37 pm

One person made a list of errata for Juregen Toppers book.

Until now, I have been approached for errata in my book. Of course, this is not to say that they don't exist.

In general, I created the equations some time before the book went into publication so we have a few rounds of checking beforehand. If you find any errors, please post.

Thank you

Daniel

Cuchulainn

Posts: 677
Joined: Mon Dec 18, 2006 2:48 pm
Location: Amsterdam, the Netherlands

Cuchulainn wrote:One person made a list of errata for Juregen Toppers book.

Until now, I have been approached for errata in my book. Of course, this is not to say that they don't exist.

In general, I created the equations some time before the book went into publication so we have a few rounds of checking beforehand. If you find any errors, please post.

Thank you

Daniel

Hi Daniel,

I don't understand equation (18.33) from the book because

it just has U^n on the rhs instead of U^(n+1) on the rhs.

I'd guess the equation should be:

U^(n+1)[i,j](1+4*lambda) =

U^n[i,j]

+ lambda*

( U^(n+1)[i-1,j]

+ U^(n+1)[i+1,j]

+ U^(n+1)[i,j-1]

+ U^(n+1)[i,j+1]

)

where:

lambda = k/h^2

IOW, the rhs is missing the 1 U^n term, and all the

other U's should have n+1 as superscript.

Is that right?

TIA.

-regards,

Larry
cppljevans

Posts: 14
Joined: Thu Jun 30, 2011 5:31 pm

Larry,

You are spot on. Thanks for that.

Daniel

Cuchulainn

Posts: 677
Joined: Mon Dec 18, 2006 2:48 pm
Location: Amsterdam, the Netherlands

Cuchulainn wrote:Larry,

You are spot on. Thanks for that.

Daniel

You're most welcome, and thanks for the book; however, I think

maybe there's an error in equation(20.10) which shows the

heat conduction equation containing mixed derivatives; yet,

on the next page, in equation(20.14), no mixed derivatives

occur, and elsewhere, I've only seen the equivalent of

equation(20.14) for the heat conduction equation:

http://en.wikipedia.org/wiki/Heat_equation
cppljevans

Posts: 14
Joined: Thu Jun 30, 2011 5:31 pm