## Acknowledgements Acknowledgements

I am grateful to

`Anita Liebenau`

for creating all of the attractive mathematical figures in these notes. Any untidy-looking hand-drawn mathematical figures were created by the author. There are several artistic pictures in the notes that were created using `Midjourney AI`

based on prompts supplied by the author.Thank you to all of the past students who have taken the course

`Math 426/529`

at the University of Victoria that these notes are based on. The questions, comments and ideas that you have raised in class have inspired a few new exercises and examples and countless improvements to the exposition in these notes.