# Daria Makes a Deal, Chapter Five

PREVIOUSLY, ON DARIA: Our Heroine has a new friend, Saavik, a clerk and aspiring actor who entered Daria’s life by way of being Tom Sloane’s girlfriend. They’re up late together at a science-fiction convention (cosplaying as Edward Elric and Motoko Kusanagi respectively). After a movie in the small hours of the morning, they encounter a woman from Daria’s past, a character that Daria believed she had never really met in the first place. And the visitor is here to tell Daria about a certain proposal….

Content note: One character gets a glimpse of another character’s fantasy that’s a touch TMI.

CHAPTER FIVE

“Perhaps we’d better discuss this outside,” Halloween said.

“Outside?” asked Daria. “In the snow?”

“Doesn’t look like snow,” Saavik said, crossing the lobby to the revolving door and pushing her way through.

Daria followed. The wind that met her as she emerged was as gentle as she expected it to be cutting. She reached out her gloved hands and gathered a few of the… “Cherry blossoms?” They caught in Saavik’s wig and melted to water, like snowflakes, on her face.
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# On “Invention”

When I was a little younger than Ahmed Mohamed is now, I invented the distance formula for Cartesian coordinates. I wanted to make a simulation of bugs that ran around and ate each other. To implement a rule like “when the predator is near the prey, it will chase the prey,” I needed to compute distances between points given their $x$- and $y$-coordinates. I knew BASIC, and I knew the Pythagorean Theorem. However many people had solved that before me, it wasn’t written down in any book that I had, so I took what I knew and figured it out.

Those few pages of PowerBASIC on MS-DOS never amounted to much by themselves, but simulating ecosystems remained an interest of mine. I returned to the general idea now and then as I learned more.

And then, hey, what’s this? It looks like a PhD thesis.

“I bet every great mathematician started by
rediscovering a bunch of ‘well known’ results.”
—Donald Knuth, Surreal Numbers

# Daria Makes a Deal, Chapter Four

PREVIOUSLY, ON DARIA: Thirteen years or so after high school, Our Heroine is a washed-up academic with a series of advanced degrees, failed relationships and irregularly successful writing efforts behind her. She left her cheating boyfriend and moved back to Boston, to live with her friend Jane Lane. Jane, now running an art shop specializing in custom movie and TV props, introduced her to a social circle featuring both old and new faces. Soon, friendship got the better of caution, and Daria found herself agreeing to cosplay Edward Elric at a science-fiction and fantasy convention.

Content note: A character recalls experiences with Pick-Up “Artistry” and blithe cissexism.

CHAPTER FOUR

The party thrummed and pulsed and mingled with itself. It wound around furniture and up steps. It carried drinks outward from the bar, where Tom watched over the grand central room of the suite, shaking cocktail mixers and spinning bottles with his white-gloved hands. His jacket-over-tunic ensemble gave the appearance of a military uniform, worn by a man with open contempt for his nominal superiors. He took a moment now and then to slide his shades back up the bridge of his nose, so that their oval lenses caught and toyed with the light.

Daria caught sight of Morgan the fire-spinner, currently in heavy makeup as a Borg drone. Ze gave Daria a nod and saluted rather solemnly with an umbrella drink. This prompted the woman with whom Morgan was speaking—a lanky figure dressed as a brown teddy bear—to turn about with an inquiring glance. Jane waved happily and beckoned Daria to join them.

This, Daria was only too happy to do, but it required working her way through a substantial amount of the crowd. A grandiose gesture from a young man she passed nearly connected with the side of her head. He looked over and then made apologetic noises, adding, “Wicked outfit!”

“Thanks,” Daria said. “Excuse me, I have to go meet its maker.”

Every third or fourth person at the party was, Daria estimated, in cosplay to some extent. This was representative of Aletheia on the whole, judging by what she had seen over the past two days.

At last, she stood beside Jane, who hooked an arm around hers and leaned in close. “Told you it would be a hit!” A lock of Jane’s hair flopped forward. A crosscross band just above eyebrow level kept the lock constrained in a bundle.

“You win the bet,” Daria said. “Do you want quatloos or woolongs?”
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# Daria Makes a Deal, Chapter Three

Content note: Reminiscences of depression and family strife. For the previous chapters, see here and here.

CHAPTER THREE

Daria’s Journal, Inaugurating a Brand New, Posh Hardback Notebook. Tuesday, 15 January 2013.

I braved the slush yesterday and made my way to a stationery store up near Raft. Treated myself to a fistful of disposable fountain pens. I hadn’t known that such things were a thing. Between these, my history of failed relationships and my coffee intake, I must be a Real Writer.

The convention—that is, the fifteenth annual Aletheia—is to kick off this Friday. Jane has Plans for my attendance. I refuse to let this frighten me.
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# Multiscale Structure in Eco-Evolutionary Dynamics

I finally have my thesis in a shape that I feel like sharing. Yes, this took over three months after my committee gave their approval. Blame my desire to explain the background material, and the background to the background….

In a complex system, the individual components are neither so tightly coupled or correlated that they can all be treated as a single unit, nor so uncorrelated that they can be approximated as independent entities. Instead, patterns of interdependency lead to structure at multiple scales of organization. Evolution excels at producing such complex structures. In turn, the existence of these complex interrelationships within a biological system affects the evolutionary dynamics of that system. I present a mathematical formalism for multiscale structure, grounded in information theory, which makes these intuitions quantitative, and I show how dynamics defined in terms of population genetics or evolutionary game theory can lead to multiscale organization. For complex systems, “more is different,” and I address this from several perspectives. Spatial hostâ€“consumer models demonstrate the importance of the structures which can arise due to dynamical pattern formation. Evolutionary game theory reveals the novel effects which can result from multiplayer games, nonlinear payoffs and ecological stochasticity. Replicator dynamics in an environment with mesoscale structure relates to generalized conditionalization rules in probability theory.

The idea of natural selection “acting at multiple levels” has been mathematized in a variety of ways, not all of which are equivalent. We will face down the confusion, using the experience developed over the course of this thesis to clarify the situation.