## Improvements to the slides

Visual notation:
* Add borders around full circles (⬤) to highlight them (e.g. during a "join").
* Try swapping Wingdings numbers (in graphs) to circled Open Sans numbers.

Thumbnails:
* They consume too much space (as in: disk usage/memory) with little added value.
* Remove/resize them.
* Emphasize that they are clickable (e.g. with blue borders).

## Add missing algorithms

* k-truss
* Luby's
* delta-stepping SSSP
* DAG BFS

## Add theoretical discussions

* Why do push-pull BFS correspont to v^T * A and A * v, resp.?
* Demonstrate worst-case optimal joins

## Colouring

Introduce some (e.g. ColorBrewer-based) colouring schema for navigation layers. Should be some pastel colours.
For example
- level 1: red
- level 2: blue
- level 3: green

Make sure that these are different enough from the LDBC colours.

## Notation for arithmetic multiplication

We could use × for "regular" arithmetic multiplication.
This symbol is slightly overloaded as it's also used for _Cartesian product_ and _vectorial product_ but these operations are not that relevant in GraphBLAS.
I don't think _outer product_ is also very relevant.

These colours could be introduced in the slide templates as well.