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Mathematical Sonnets

Pedro Poitevin

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Contents

  1. Reversibility
  2. Lost and Found
  3. Heirloom
  4. The Observer Effect
  5. Self-Portrait as a Cauchy Sequence
  6. In Praise of Smaller Models
  7. Counter-Exemplary Tranquility
  8. Arithmetic Ozymandias
  9. Recurrence
  10. Dichotomy
  11. Divertimentum Ornithologicum
  12. Upon Inspecting the Mandelbrot Set
SONNET I

Reversibility

When in the throes of vigorous spring cleaning I find myself permuting furniture, the conservation laws acquire meaning other mathematicians would abjure.
My wife and I have spent ten years together and, entropy be damned, our energy persists in ways not even Emmy Noether saw when characterizing symmetry.
Touching my chin, I come to understand the purpose in the angle of her frown— a silent plea for me to lend a hand and turn the hanging mirror upside down.
I tell myself, while humoring her whim: Mirror rim, sides reversed, is mirror rim.
SONNET II

Lost and Found

I run a service for abandoned hearts within the basement of a shuttered house to which rich would-be clients come to browse in hopes of finding perfect counterparts.
When one points out a sculpted beau or belle, I step into the back room with my sword; then, five cuts later, when the clavichord delivers its refrain, I cast the spell.
The models speak and bow and fall in line looking exactly as the clients want: they greet; they yearn; they tease; they even taunt; they don't betray the flaws in their design.
For every earning, manic, lonesome body, forever yearning man, I clone somebody.
SONNET III

Heirloom

I turn with terror and horror from this
lamentable plague of functions which
have no derivatives. — Charles Hermite
However hard you try, you must admit there isn't any moment of the day at which you could predict what I would say or do the very moment after it.
You may be reading this, for instance, now, and come to trust you know where it will go, but you don't have the slightest clue, no, no, because a turn is coming, anyhow.
So you proclaim me pathological, my failure to be smooth at any time engendering a Dantean, slopeless climb, a wager that would terrify Pascal.
However, I am legion, to be fair, while you are meager, in the sense of Baire.
SONNET IV

The Observer Effect

For every function \(f\) assigning to each real number
a countable set of real numbers, there exist \(x\) and \(y\)
such that \(x \notin f(y)\) and \(y \notin f(x)\).
No matter how the logos preordains the set of nuisances each person weathers; no matter how affection slips its tethers and rusts within a tide that seldom wanes;
no matter that my father and my mother have met each other's glances with a sigh, there must exist a couple, \(x\) and \(y\), who'd never scowl or barb at one another.
Imagine \(x\) and \(y\) one day agree to go out on a date devoid of grief, and \(x\) expounds at length on his belief in Freiling's Axiom of Symmetry;
\(y\) can't quite take the measure of the claim and starts to think that \(x\) might be to blame.
SONNET V

Self-Portrait as a Cauchy Sequence

For Zhong-Jin Ruan
However tiny epsilon may be, there is a moment after which I'll stay within an epsilon-vicinity of who I am that moment of the day.
I'll waver just as though I were a string someone had plucked to hear the note it made, a wanderer in sunlight wondering: Who is this shadow-self to whom I fade?
And when the slow unwinding dims the skies, my failure to converge—so bittersweet— will lead me to lie down and recognize the logos didn't make the world complete.
So what? I'll raise my glass and make a toast to life in search of my departed ghost.
SONNET VI

In Praise of Smaller Models

For Ward Henson
When I was twenty-five and in the flower of mathematical ingenuousness, I read Fréchet and took my ultrapower to have more witnesses to my excess.
I satisfied all types: each dot-dot-dot, no longer brush strokes of some mystery, resolved itself into a finished thought that I could find embodied within me.
When my maturity arrived, I used Löwenheim-Skolem to slim down a bit: all those nonstandard objects I refused to keep had swollen up the soul of wit.
Yet \(\hat{I}\) and I are, in our discontent, elementarily equivalent.
SONNET VII

Counter-Exemplary Tranquility

Conway's base-13 function:
Write a real number \(x\) in base 13 using \(0,1,\ldots,9,A,B,C\).
If from some point onward the expansion reads
\(\ldots Ax_1x_2\ldots x_nCy_1y_2\ldots\) then \(f(x) = +x_1x_2\ldots x_n.y_1y_2\ldots\)
If instead \(\ldots Bx_1x_2\ldots x_nCy_1y_2\ldots\) then \(f(x) = -x_1x_2\ldots x_n.y_1y_2\ldots\)
Otherwise, \(f(x) = 0\).
These fire-and-brimstone, MAGA days I go from numb estrangement to indignant rage, a Weierstrassian zig-zag-vertigo and dread at the news cycle of the age.
Between those two extremes, one would surmise, there should be times when wisdom reigns supreme: no Felon, Pee Wee German, DOGE, or ICE; no damn doomscrolling and no dopey meme.
The Intermediate Value Theorem pledges, so long as continuity is met, that here and there, along the blur of edges, there's fleeting equanimity, and yet
I sense a Conway-demiurge has been enciphering the days in base thirteen.
SONNET VIII

Arithmetic Ozymandias

The termination of Goodstein sequences is
unprovable in first-order Peano arithmetic.
I met a traveler from an antique land who said: “I saw a sequence grow—it grew, its number dwarfing all the desert sand, but in what base it did so no one knew.
Each term was vastly larger than the last, as if to boast of boasting even more; no sooner one observed its growth was fast, the growth became much faster than before.
A puny minus one—memento mori— nipped at its heels while listening to it say: ‘My name is Goodstein, watch my golden glory!’ Nothing of it remains. Round the decay
of that colossal wreck, the number zero has claimed the bones of the mysterious hero.”
SONNET IX

Recurrence

Pólya's Theorem: a simple random walk on a \(d\)-dimensional
lattice is recurrent for \(d = 1, 2\) and transient for \(d > 2\).
Xenakis in my earbuds—Rebonds B—, today I grabbed a coffee on the go and took a random walk across the snow, ignoring whether ICE would question me.
I traced the neighborhood's familiar ground. Each corner I would flip a quarter twice: I figured that the outcomes would suffice to code for left or right, straight, turn around.
And as I walked, I thought about migration: Am I no one, who Polyphemus tried to trap within the cave—so says my pride— or just a brown dot in this whitening nation?
I cursed the impulse that had made me roam, but somehow Pólya's Theorem got me home.
SONNET X

Dichotomy

An arbitrary infinite-dimensional Banach space either
contains a subspace with an unconditional basis or a
hereditarily indecomposable subspace.
Once in a while I scrutinize the sky and sense the logos is a Banach space, my little section represented by some basis giving structure to the place.
The branches bending in the wind are there, as is the river, cold against my toes, where I skipped countless pebbles to compare the many forms a single motion knows.
But lacking any natural sense of angle, this territory that I call my lot may be no idyll but a boundless tangle ensnaring even this discordant thought.
If so, this sonnet has no way to flee its own indecomposability.
SONNET XI

Divertimentum Ornithologicum

After Jorge Luis Borges's
Argumentum Ornithologicum
A synchrony of wings across the sky is quavering in its feathered beats of flight. Their number is too high to count— I try to estimate it but I can't: the night
is dark, the birds are black, my eyes are weak. Certainly less than \(N\) but more than \(k\), I tell myself, but then, in an oblique arrow of thought, I argue with dismay
that if \(k\) is too small, then \(k + 1\) can't be enough, and so, inductively, all of God's natural numbers fail—there's none determining how many birds I see.
I start to sketch a proof He can't exist, but \(N\) being hyperfinite, I desist.
SONNET XII

Upon Inspecting the Mandelbrot Set

I find myself absorbed by what I find within a hole within a hole within a surface I don't know how to begin to trace without perceiving that my mind
is spiraling toward the undefined, its curlicues with curlicues that spin like pegs I turn to tune a violin I nonetheless can't play. I stand resigned
to sink into the void, to simply sink, to sigh because I cannot help but sigh, to mean to see what's meant for me to see, to think the thoughts I think, or thought I'd think,
to know the die's been cast before I die, and be the wonder wondering to be.