Reuben W. Nixon-Hill

I was running on windows 10 (x64) and my colleague on macOS.

Relatively crudely: memory usage in task manager goes from under 100 MB to the PC maximum within about 10 seconds. It may not be a memory leak but it certainly...

@stevengj I can confirm that adding `yield()` after `ZMQ.send(socket, "$zipcode $temperature $relhumidity")` resolves the memory issue. ``` using ZMQ context = Context() socket = Socket(context, PUB) ZMQ.bind(socket, "tcp://*:5556") while true...

I've submitted a pull request using the changes here, see https://github.com/booksbyus/zguide/pull/697.

> Also the word cofunction seems to be reserved a different meaning, https://en.wikipedia.org/wiki/Cofunction. Here it's being used to refer to the category theory meaning (hence the link at the top...

Note: to create a mesh of disconnected _vertices_ (i.e. a point cloud) you need `tdim=0`

UFL should support vertex cells - at least I added such support to the [github hosted FEniCS/ufl](https://github.com/FEniCS/ufl/ ) repository which I believe is the current UFL core and appears to...

Relevant PR https://github.com/FEniCS/ufl/pull/30

`point` and `vertex` are often used synonymously, but it seems that, in UFL at least, `vertex` is the term used to refer to a 0D simplex (see https://github.com/FEniCS/ufl/blob/master/ufl/cell.py). It looks...