11 January 2016

Between sunrise and sunset in Uppsala

People ask me how much daylight do we get in Uppsala these days. The official answer is that the sun rises at 8:42 am today, 16 January 2016, and sets at 3:12 pm. But the real answer is in the video clip here. In it, you can see what the sun looks like between "sunrise" and "sunset.

What is rather peculiar here is that people don't like lights. Restaurants, for instance, turn their lights down during darkness, so much so that one needs a flashlight in order to read the menu. I find this practice extremely irrational and peculiar. (See also here for a related story.)

P.S. Walking on the streets, you see people whose sole purpose is to walk towards their death, or so it seems. They never speak, they don't respond to a "hello", they are miserable-looking. It looks like they are walking straight to their grave.

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What measure theory is about

It's about counting, but when things get too large.
Put otherwise, it's about addition of positive numbers, but when these numbers are far too many.

The principle of dynamic programming

max_{x,y} [f(x) + g(x,y)] = max_x [f(x) + max_y g(x,y)]

The bottom line

Nuestras horas son minutos cuando esperamos saber y siglos cuando sabemos lo que se puede aprender.
(Our hours are minutes when we wait to learn and centuries when we know what is to be learnt.) --António Machado

Αγεωμέτρητος μηδείς εισίτω.
(Those who do not know geometry may not enter.) --Plato

Sapere Aude! Habe Muth, dich deines eigenen Verstandes zu bedienen!
(Dare to know! Have courage to use your own reason!) --Kant