My old webpage is here.
april 24, 2015 04:02pm permalink
Unsuspecting, I picked this classic baby toy up at a local charity sale. As it turned out, it harbours a little combinatorial challenge that I never suspected! The toy is a set of five stacking cubes with a different face on each face. Save for size, the cubes are all the identical; flower, hexagon, square, triangle, circle, and the open face.
As I was playing with it I thought, "Can I stack the cubes such that no two shapes coincide?". Fun!
This is the same as asking if you can orient 5 6-sided (axis-aligned) dice so that no two dice show the same number on the same side.
Is there more than one way to do it? Can it be done with 6 stacking cubes?
november 14, 2014 01:13pm permalink
For some reason the templates in BibDesk never do quite what I want, and I end up spending hours remaking templates. That is what I did today, in order to list a few of my publications on my homepage in HTML. For example, the ones below (click here for the list on my academic homepage):
november 11, 2014 06:59am permalink
I have been doing art for myself, my friends, and whoever wishes to peer into my life through the Inter-window for a few years now, but one thing I want more of is artistic collaboration. It seems to me that there is not better way to get to know another artist, or strengthen a friendship than doing something creative together.
Musicians get this (if you'll allow the generalisation). Many other artists do too, but the vast majority of us are working alone. I am looking for collaborative experiences, and as a first step, I'm proud to present the following collaboration between myself and my childhood friend Patrick Montgomery.
"Psychotic Storm" began with a nighttime thunderstorm over Lake Michigan, where I laid my film camera on the promenade in Chicago for a long exposure. Patrick's textures and "psychotic" colour palette emphasise the uneasy tension between the typically serene sailboats resting on calm waters, and the tumultuous sky above them.
Reworked image: Psychotic Storm
november 05, 2014 10:50am permalink
Having grown up around SLR cameras, I have always had an appreciation for the superior image quality that a "proper" camera is capable of. I have owned severalof them, and I am quite familiar with the technical aspects of exposure and depth of field. A tipping point occured, however, when I got my hands on a Sony alpha A7 this year. I went on to read The Landscape Workshop by Ross Hoddinott and Mark Bauer, and dove into capturing the rural landscape around my home in the North East of England.
Here is one of my "keepers":
Here is another one:
october 23, 2014 10:55am permalink
I am a Canadian citizen, resident in England, and I have recently learnt some things while getting a UK Driving Licence. First and foremost, the following website is a gold mine:
HOW TO EXCHANGE A CANADIAN DRIVER'S LICENCE FOR UK LICENCE
Read that whole webpage.
There were a few details missing, however, as regards insurance and provisional entitlements, and I will fill those in here. As you will learn at gregwtravels, you can exchange you Canadian licence for a Category B restricted to Automatic (this is code 78).
The first thing I can confirm is that you do not need to have your photos signed if you send in your Canadian passport (i.e. you do not need a UK passport). At the time of this writing gregwtravels says "I take that to mean that an up-to-date Canadian passport is identity enough.". Yes, it was enough for me, and if you read the instructions that come with the D1 form, you can reassure yourself of this.
To fully understand the codes on your licence, you should refer to the following document:
Information on driving licences INS57P
The INS57P is the pamphlet code at the time of this writing, in case the link goes dead. You should be able to find the same pamphlet by searching for INS57P driving licences.
INS57P also tells you that you can find your provisional entitlements on your "Counterpart Driving Licence", which is the paper document that came in the mail with your photocard. This is where you can verify gregwtravels' claim that you can drive a Category B (without restriction) as a provisional driver. I have checked with a human at the DVLA, to confirm that you must be accompanied by a fully licenced (IN THE UK) Category B driver for this to work (i.e. not your Canadian partner who is still on their international driver's licence).
The next question for me was "How do I insure myself to take the test in my own car?". You need insurance that covers you as a provisional driver, plus the car must have its own "full" insurance. This cost me 85 GBP from https://www.provisionalmarmalade.co.uk, but at the time of this writing, I have not confirmed that my setup works. That is, I think I am covered because: