##Preface
This online Textbook based on half-year course APM346 at [Department of Mathematics, University of Toronto](http://www.math.toronto.edu) but contains many additions.
#####Navigation
* $\Uparrow$ Home (Table of contents). It would be a good idea to add "Home" to your bookmarks.
* $\Leftarrow$ Previous.
* $\Rightarrow$ Next.
* $\Downarrow$ and $\downarrow$ To low level material (say Problems or Appendix to Section).
* $\uparrow$ From low to normal-level material.
#####Source
This Textbook is *open* (which means that anyone can use it without any permission or fees) and *open-source* (which means that anyone can easily modify it for his or her own needs) and it will remain this way forever. Source (in the form of [Markdown](https://en.wikipedia.org/wiki/Markdown)) of each page could be downloaded: this page's URL is
`http://www.math.toronto.edu/courses/apm346h1/20159/PDE-textbook/Chapter0/S0.html`
and its source's URL is
`http://www.math.toronto.edu/courses/apm346h1/20159/PDE-textbook/Chapter0/S0.md`
and for all other pages respectively.
The [Source](./PDE-textbook-source.gz) of the whole book could be downloaded as well. Also could be downloaded [Textbook in pdf format](../PDE-textbook.pdf) and [TeX Source](../PDE-textbook-texsource.gz) (*when those are ready*).
*While each page and its source are updated as needed those three are updated only after semester ends.*
[Victor Ivrii](http://www.math.toronto.edu/cms/ivrii-victor/)
[Department of Mathematics](http://www.math.toronto.edu)
[University of Toronto](http://www.toronto.edu)
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[$\color{gray}\Leftarrow$]() [$\Uparrow$](../contents.html) [$\Rightarrow$](./S0.1.html)
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.