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the devil came down - Lindsey Kuper [entries|archive|friends|userinfo]
Lindsey Kuper

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the devil came down [Sep. 20th, 2008|09:46 pm]
Lindsey Kuper

On Thursday night, I ran off to Atlanta for the weekend. Hey, it's only gonna be peak oil once.

While Alex was at work yesterday, I finally got caught up on the reading for B561 (Ask me what set division is! (Please!)), and then we went to a swanky hair salon, the first you-need-an-appointment place I've been to in years, and made an appointment for getting something done about my long-since-grown-out buzz cut. Then, we went for a long run in the park:

*We run past a man wearing a PETA shirt, who is out walking his dog.*
Alex: PETA shirt.
Lindsey: He's going to kill that dog later. And eat it.
Lindsey: *Laughs maniacally for an eighth of a mile.*

I really don't understand why he tolerates me.

Today we went to the assisted living facility office, where I got some more homework done, and then we went to the hair salon, where Oliver turned my rather ridiculous all-one-length hair into a pretty pixie cut. I confessed to him my secret desire to bleach it, and he said, "Yeah, I was going to say as soon as you walked in that it needs to be platinum blonde." Unfortunately, there was no time to do that today (it would take a long time to turn my hair that color), but I'm considering it for next time.

Back at home this evening, Alex and Mark and I stir-fried some onions, okra, peppers, and eggplant, and I made spinach-and-arugula salad with dressing made of honey, apple cider vinegar, olive oil, dry mustard, sliced toasted almonds, and golden raisins, all of which I found already existing in the kitchen cupboards, and right now, I'm relaxing on the old clawed-up orange couch while the guys play su-ri-tu fa-ta.

Tomorrow night, I have to go back to (away from?) the real world. But for tonight, we're going to go dance. (I brought the boots.)


[User Picture]From: stereotype441
2008-09-21 03:46 am (UTC)
What's set division?
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[User Picture]From: lindseykuper
2008-09-22 06:19 pm (UTC)
Okay, so one good way to explain set division is by analogy with integer division. When you divide integers A/B, you get Q, where Q is the largest integer such that QBA. Likewise, when you divide sets A and B, you get a set Q, where Q is the largest set such that Q × BA.

For instance, if A is a set of pairs

A = { (3, orange), (4, orange), (5, orange), (6, orange), (3, green), (6, green), (2, pink) },

and B is a set of 1-tuples

B = { (orange), (green) },

Then A/B would be a set of 1-tuples { (3), (6) }.

For me, it's helpful to remember that, just like integer division, it's roughly the case that, the smaller of a B you have, the bigger a Q you'll end up with. (If B = { orange }, A/B = { (3), (4), (5), (6) }.)

If this were a database, A and B would be tables, and tuples would be rows. This operation isn't done particularly often, but we've been talking about it mostly because it's a cute example of how the relational algebra operations can be composed.

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[User Picture]From: kel_e_o
2008-09-22 05:27 pm (UTC)
I really hope that you're not serious about that last sentence.

I'm sorry that I missed you being in town! :(
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[User Picture]From: lindseykuper
2008-09-22 05:45 pm (UTC)
The part about my boots? Oh, I was entirely serious. It's a pain to get through security with those things, by the way.

One of these days, we'll get to hang out.
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[User Picture]From: deepdistraction
2008-09-22 07:13 pm (UTC)
You are gonna look swanky in those boots with your eventual plantinum blonde locks, sweatin' on the dance floor. Makes me wonder what other PhD candidates lead lives of relative abandon on THEIR weekends
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[User Picture]From: lindseykuper
2008-09-25 03:20 am (UTC)
I think I look good in those boots already! But dying my hair an unnatural color can only help, right?

Also, I can't call myself a "Ph.D. candidate" until I pass quals. For the moment I'm merely a "Ph.D. student".
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[User Picture]From: deepdistraction
2008-09-25 04:33 am (UTC)
I stand corrected.
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[User Picture]From: deepdistraction
2008-09-24 03:41 pm (UTC)
PETA's in the news here lately (http://getactive.peta.org/campaign/iowa_pigfarm_abuse2) because they surreptitiously got some folks hired into a hog factory farm and captured some horrific, grisly video of animal abuse there. So go easy on the jokes, Lindsey--PETA gets raked over the coals by all kinds of people but they are gutsy and their hearts are in the right place. Still, now Alex is duly warned that your sense of humor can veer into uncharted waters. (the big, big bowl of eggs, etc.)
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