Replying to ncohen:

[...]

Tell me if my answers above convinced you.

Yes: this ticket should not go without a `graphs.IntersectionGraph`

. And intersection graphs of non-trivial BIBD are regular graph. So it is worth to have them at least in the doc of `graphs.IntersectionGraph`

.

For the parameters: they are explicit in terms of (k,n) for TD and (v,k) for BIBD.

- for TD(k,n): lambda=(k-1)(k-2)+n-2, mu=k(k-1)
- for BIBD(v,k): lambda=(k-1)
^{2}+(v-1)/(k-1)-2, mu=k^{2}

and this should be mentioned and tested.

By the way, why is there no BIBD in the Brouwer table?

Vincent