Wednesday 3 September 2008

Catching the train

In mathematics, A and B commute if AB=BA. In commuting, the order does matter. The Town Hall train (that's the one via Town Hall, or is it the one with destination Town Hall?) is not the same as the Museum train (the one to Town Hall, or the one to Museum?)

Changing sides of the world makes a difference, too. Now I'm in Sydney, I no longer need a dog to carry on the escalators. However, I'm having trouble satisfying the request to keep hold of children while boarding the train. At least I am not asked to keep a firm grip on a pram unless it is mine and I am travelling with it.

5 comments:

Crazyjedidiah said...

ok, i mostly understood that, except the bit about the dogs, at the risk of sounding like a red headed politician i will say Please Explain?

Jonathan said...

Ok, red-headed snippet... do you mean the maths, the dogs, or something else?

tdix said...

If you run to get the train, it might catch you.

Crazyjedidiah said...

the bit i didn't understand was about the dogs

Jonathan said...

"Dogs must be carried on the escalator" - London Underground signs.