Outside their apartment they acquired the Specials again. Hari felt they were unnecessary; Dors was quite enough. But he could scarcely explain that to Imperial officials. There were other Specials on the floors above and below as well, a full-volume defense screen. Hari waved to friends he saw on the way across the Streeling campus, but the presence of the Specials held them at too great a distance to speak.

 He had a lot of Mathist Department business to tend to, but he followed his instinct and put his calculations first. Briskly he re­ trieved his ideas from the bedside notepad and stared at them, doodling absently in air, stirring symbols like a pot of soup, for over an hour.

 When he was a teenager the rigid drills of schooling had made him think that mathematics was just felicity with a particular kind of minutiae, knowing things, a sort of high-grade coin collecting. You learned relations and theorems and put them together.

 Only slowly did he glimpse the soaring structures above each discipline. Great spans joined the vistas of topology to the infinites­ imal intricacies of differentials, or the plodding styles of number theory to the shifting sands of group analysis. Only then did he see mathematics as a landscape, a territory of the mind to rove and scout.

 To traverse those expanses he worked in mind time—long stretches of uninterrupted flow when he could concentrate utterly on problems, fixing them like flies in timeless amber, turning them this way and that to his inspecting light, until they yielded their secrets.

 Phones, people, politics—all these transpired in real time, snip­ ping his thought train, killing mind time. So he let Yugo and Dors and others fend off the world throughout the morning.

 But today Yugo himself snipped his concentration. “Just a mo,” he said, slipping through the crackling door field. “This paper look right?”

 He and Yugo had developed a plausible cover for the psychohis­ tory project. They regularly published research on the nonlinear analysis of “social nuggets and knots,” a subfield with an honorable and dull history. Their analysis applied to subgroups and factions in Trantor, and occasionally on other worlds.

 The research was in fact useful to psychohistory, serving as a subset of equations to what Yugo insisted on calling the full “Seldon Equations.” Hari had given up being irked at this term, even though he wished to keep a personal distance from the theory.

 Though scarcely a waking hour passed without his thinking about psychohistory, he did not want it to be a template for his own worldview. Nothing rooted in a particular personality could hope to describe the horde of saints and rascals revealed by human his­ tory. One had to take the longest view possible.

 “See,” Yugo said, making lines of print and symbols coalesce on Hari’s holo. “I got all the analysis of the Dahlite crisis. Neat as you please, huh?”

 “Um, what’s the Dahlite crisis?”

 Yugo’s surprise was profound. “We’re not bein’ represented!”

 “You live in Streeling.”

 “Once a Dahlan, you’re always one. Just like you, from Helical.”

 “Helicon. I see, you don’t have enough delegates in the Low Council?”

 “Or the High!”

 “The Codes allow—”

 “They’re out of date.”

 “Dahlites get a proportional share—”

 “And our neighbors, the Ratannanahs and the Quippons, they’re schemin’ against us.”

 “How so?”

 “There’re Dahlans in plenty other Sectors. They don’t get repres­ ented.”

 “You’re spoken for by our Streeling—”

 “Look, Hari, you’re a Helical. Wouldn’t understand. Plenty Sec­ tors, they’re just places to sleep. Dahl is a people.”

 “The Codes set forth rules for accommodating separate subcul­ tures, ethnicities—”

 “They’re not workin’.”

 Hari saw from Yugo’s jutting jaw that this was not a point for graceful debate. He did know something of the slowly gathering constitutional crisis. The Codes had maintained a balance of forces for millennia, but only by innovative adaptation. Little of that seemed available now. “We agree on that. So how does our research bear upon Dahl?”

 “See, I took the socio-factor analysis and—”

 Yugo had an intuitive grasp of nonlinear equations. It was always a pleasure to watch his big hands cut the air, slicing through points and pounding objections to pulp. And the calculations were good, if a bit simple.

 The nuggets-and-knots work attracted little attention. It had made some in mathematics write him off as a promising young man who had never risen to his potential. This was perfectly all right with Hari. Some mathists guessed that his true core research went unpublished; these he treated kindly but gave no hint of confirmation.

 “—so there’s a pressure-nugget buildin’ in Dahl, you bet,” Yugo finished.

 “Of course, glancing at the news holos shows that.”

 “Well, yeah—but I’ve proved it’s justified.”

 Hari kept his face composed; Yugo was really worked up about this. “You’ve shown one of the factors. But there are others in the knot equations.”

 “Well, sure, but everybody knows—”

 “What everybody knows doesn’t need much proof. Unless, of course, it’s wrong.”

 Yugo’s face showed a rush of emotions: surprise, concern, anger, hurt, puzzlement. “You don’t support Dahl, Hari?”

 “Of course I do, Yugo.” Actually, the truth was that Hari didn’t care. But that was too bald a point to make, with Yugo seeming wounded. “Look, the paper is fine. Publish.”

 “The three basic knot equations, they’re yours.”

 “No need to call them that.”

 “Sure, just like before. But your name goes on the paper.”

 Something tickled Hari’s mind, but he saw the right answer now was to reassure Yugo. “If you like.”

 Yugo went on about details of publication, and Hari let his eyes drift over the equations. Terms for representation in models of Trantorian democracy, value tables for social pressures, the whole apparatus. A bit stuffy. But reassuring to those who suspected that he was hiding his major results—as he was, of course.

 Hari sighed. Dahl was a festering political sore. Dahlites on Trantor mirrored the culture of the Dahl Galactic Zone. Every powerful Zone had its own Sectors in Trantor, for influence-peddling and general pressuring.

 But Dahl was minor on the scale that he wanted to ex-plore—simple, even trivial. The knot equations which described High Council representation were truncated forms of the immensely worse riddle of Trantor.

 All of Trantor—one teeming world, baffling in its sheer size, its intricate connections, meaningless coincidences, random juxtapos­ itions, sensitive dependencies. His equations were still terribly in­ adequate for this shell which housed forty billion bustling souls.

 How much worse was the Empire!

 People, confronting bewildering complexity, tend to find their saturation level. They master the easy connections, local links, and rules of thumb. They push this until they meet a wall of complexity too thick and high and hard to grasp, to climb.

 There they stall. Gossip, consult, fret—and finally, gamble.

 The Empire of twenty-five million worlds was a problem greater even than understanding the whole rest of the universe—because at least the galaxies beyond did not have humans in them. The blind, blunt motions of stars and gas were child’s play, compared to the convoluted trajectories of people.

 Sometimes it wore him down. Trantor was bad enough, eight hundred Sectors with forty billion people. What of the Empire, with twenty-five million planets of average four billion souls apiece? One hundred quadrillion people!

 Worlds interacted through the narrow necks of wormholes, which at least simplified some of the economic issues. But culture traveled at the speed of light through wormholes, information without mass, zooming across the Galaxy in destabilizing waves. A farmer on Oskatoon knew that a duchy had fallen on the other side of the Galactic disk a few hours after the blood on the palace floor started turning brown.

 How to include that?

 Clearly, the Empire extended beyond the Complexity Horizon of any person or computer. Only sets of equations which did not try to keep track of every detail could work.

 Which meant that an individual was nothing on the scale of events worth studying. Even a million made about as much differ­ ence as a single raindrop falling in a lake.

 Suddenly Hari was even more glad that he had kept psychohistory secret. How would people react if they knew that he thought they didn’t matter?

 “Hari? Hari?”

 He had been musing again. Yugo was still in the office. “Oh, sorry, just mulling over—”

 “The department meeting.”

 “What?

 “You called it for today.”

 “Oh, no.” He was halfway through a calculation. “Can’t we delay…?”

 “The whole department? They’re waiting.”

 Hari dutifully followed Yugo into the assembly room. The three traditional levels were already filled. Cleon’s patronage had filled out an already high-ranked department until it was probably—how could one measure such things?—the best on Trantor. It had spe­ cialists in myriad disciplines, even areas whose very definitions Hari was a bit vague about.

 Hari took his position at the hub of the highest level, at the exact center of the room. Mathists liked geometries which mirrored real­ ities, so the full professors sat on a round, raised platform, in air-chairs with ample arms.

 Forming a larger annulus around them, a few steps lower, were the associate professors—those with tenure, but still at the middle rank in their careers. They had comfortable chairs, though without full computing and holo functions.

 Below them, almost in a pit, were the untenured professors, on simple chairs of sturdy design. The oldest sat nearest the room’s center. In their outer ranks were the instructors and assistants, on plain benches without any computer capabilities whatever. Yugo rested there, scowling, plainly feeling out of place.

 Hari had always thought it was either enraging or hilarious, de­ pending on his mood, that one of the most productive members of the department, Yugo, should have such low status. This was the true price of keeping psychohistory secret. The pain of this he tried to soothe by giving Yugo a good office and other perks. Yugo seemed to care little for status, since he had already ascended so far. And all without the Civil Service exams, too.

 Today, Hari decided to make a little mischief. “Thank you, col­ leagues, for attending. We have many administrative matters to engage. Yugo?”

 A rustle. Yugo’s eyes widened, but he stood up quickly and climbed up to the speaker’s platform.

 He always had someone else chair meetings, even though as chairman he had called them, chosen the hour, fixed the agenda. He knew that some regarded him as a strong personality, simply by dint of knowing the research agenda so deeply.

 That was a common error, mistaking knowledge for command. He had found that if he presided, there was little dissent from his own views. To get open discussion demanded that he sit back and listen and take notes, intervening only at key moments.

 Years ago Yugo had wondered why he did this, and Hari waved away the problem. “I’m not a leader,” he said. Yugo gave him a strange look, as if to say, Who do you think you’re kidding?

 Hari smiled to himself. Some of the full professors around him were muttering, casting glances. Yugo launched into the agenda, speaking quickly in a strong, clear voice.

 Hari sat back and watched irritation wash over some of his es­ teemed colleagues. Noses wrinkled at Yugo’s broad accent. One of them mouthed to another, Dahlite! and was answered, Upstart!

 About time they got “a bit of the boot,” as his father had once termed it. And for Yugo to get a taste of running the department.

 After all, this First Minister business could get worse. He could need a replacement.

 4.

 “We should leave soon,” Hari said, scribbling on his notepad.

 “Why? The reception doesn’t start for ages.” She smoothed out her dress with great care, eyes critical.

 “I want to take a walk on the way.”

 “The reception is in Dahviti Sector.”

 “Humor me.”

 She pulled on the sheath dress with some effort. “I wish this weren’t the style.”

 “Wear something else, then.”

 “This is your first appearance at an Imperial affair. You’ll want to look your best.”

 “Translation: you look your best and stand next to me.”

 “You’re just wearing that Streeling professorial garb.”