Solutions to certain exercises

It can be difficult to know whether ones solutions to the recommended exercises are correct or not. I therefore plan to publish some suggestions for solutions. Naturally in my own illegible handwriting - but it is better than nothing, I hope.

Exercises fro Lecture 1 (1.11, 1.14 and 1.21)

Exercises fro Lecture 2 (1.22, 1.25a and 1.31)¶