Reinhard Diestel: Graph theory lectures

These videos are live recordings, minimally edited, of 52 lectures on graph theory that I gave at Hamburg University in 2023/24. They are based on the 6th edition of my Graph Theory book, which is available now in various eBook editions from

       https://diestel-graph-theory.com

The print edition appeared with Springer in 2025.

The lectures recorded here are meant to complement, not duplicate, what I wrote in the book. You'll see  me draw pictures on the board; explore false proof leads; motivate theorems and proofs. You'll also hear the occasional anecdote, or musings on what mathematics is (or is not) all about.

These lectures are not slick renderings of the material in the book. They  are hands-on attempts at feeling my way towards that material – which I tried to perfect there, but to re-enact slowly here. And, of course, there are countless slips which I didn't even try to edit out...

Have fun!  And, if in doubt, consult the book.