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matthewconroy.mathstodon.xyz.ap.brid.gy
Matthew Conroy
@matthewconroy.mathstodon.xyz.ap.brid.gy
40 followers 3 following 270 posts
I'm a mathematics teaching professor in Seattle. I taught discrete modeling for a bunch of years, but I'll be teaching intro to proofs and real analysis in the […]

🌉 bridged from ⁂ https://mathstodon.xyz/@matthewconroy, follow @ap.brid.gy to interact
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matthewconroy.mathstodon.xyz.ap.brid.gy
Another animated of a Library of Congress stereograph.

#photography #stereograph #train
December 15, 2025 at 12:59 AM
matthewconroy.mathstodon.xyz.ap.brid.gy
Another animated Library of Congress stereograph. "Around the Dead Sea. Man floating with book and umbrella in hands" (1900-1920?).

#animation #animatedgif #photography #stereograph
December 8, 2025 at 7:24 AM
matthewconroy.mathstodon.xyz.ap.brid.gy
Another animated Library of Congress stereograph. "Skating on the lake, Central Park, New York, N.Y., U.S.A.". Circa 1902.

When I was in college, I skated on Lake Winnipesaukee once. There were only four of us on the ice. We'd cleared off a section of the […]

[Original post on mathstodon.xyz]
December 8, 2025 at 6:36 AM
matthewconroy.mathstodon.xyz.ap.brid.gy
Another animated Library of Congress stereograph. "Checking wounded French before removal to base hospital. Northern France. European war". 1917.

#stereograph #animation #animatedgif #war #photography
December 8, 2025 at 6:05 AM
matthewconroy.mathstodon.xyz.ap.brid.gy
I'm writing final exams today, but this leaf is on my table and making me look at it so I figured it wanted you to look at it, too.

#leaf #plant #photography #photo
A dry leaf on a metal table. The leaf is brown. There is a crack in the lead through which the table is visible.
December 6, 2025 at 10:30 PM
matthewconroy.mathstodon.xyz.ap.brid.gy
There is some rain in my forecast here in Seattle.
A piece of the U.S. National Weather Service's weather forecast for the next week showing rain forecast for each day and night. Text taken from image: Detailed Forecast Tonight Rain, n betwee Thursday Rain, nm precipi Thursday Night Rain. S amoun Friday Rain. H amoun Friday Night Rain. L amoun Saturday Rain. H possibl Saturday Night Rain. L Sunday Rain. C Sunday Night Rain. M Monday Rain. C Monday Night Rain. C Tuesday Rain. C Tuesday Night Rain. C Wednesday Rain. C
December 4, 2025 at 2:37 AM
matthewconroy.mathstodon.xyz.ap.brid.gy
Another animation from a Library of Congress stereograph from 1902.

https://www.loc.gov/pictures/item/2022648844/resource/
November 30, 2025 at 6:49 AM
matthewconroy.mathstodon.xyz.ap.brid.gy
#noisevember is almost over! Here's another guitar-based thing with live Csound processing, another experiment in getting waveforms to interfere with each other. Using a new method here, but it's a little subtle, but the whole thing came out nice, I think […]

[Original post on mathstodon.xyz]
Very abstract-looking close-up of an electric guitar string with lots of circles of confusion from dust on the dusty guitar. Nothing in focus. The string runs from top to bottom just to the left of center.
November 30, 2025 at 5:23 AM
matthewconroy.mathstodon.xyz.ap.brid.gy
Happy International Subtractive Poetry Day to all who celebrate!

(from My Great Love, No. 4)

#nonsense #silly #poetry
A cell from a comic book. A man and a woman face each other. The speech bubbles have been editing, leaving only "TO BE YOU MUST" in the woman's bubble, and "THINK WRONG" in the man's bubble.
November 27, 2025 at 4:19 AM
matthewconroy.mathstodon.xyz.ap.brid.gy
Happy International Subtractive Poetry Day to all who celebrate!

(from War Battles No. 6)

#nonsense #silly #poetry #subtractivepoetryday
A modified comic book cell with three soldiers. One word bubble says "DOPE!" and another says "HOPE!". The background is bright reddish orange.
November 26, 2025 at 8:08 PM
matthewconroy.mathstodon.xyz.ap.brid.gy
#noisevember! Tried a little live-processed flute. I've had this flute for 50 years, since 4th grade, but have not played it at all for many years. Processed it with Csound, doing the delayed-copies-of-the-signal-interfere-with-each-other-spectrally thing. I […]

[Original post on mathstodon.xyz]
A closeup of a flute showing two keys with corrosion.
November 26, 2025 at 6:21 AM
matthewconroy.mathstodon.xyz.ap.brid.gy
#noisevember! I revisited the Littlewood polynomial sound from day 2 of Noisevember. I thought to investigate a different sort of polynomial. Here, instead of polynomials with coefficients all ±1, the polynomials have coefficient ±1/(n+1) on the x^n term. As […]

[Original post on mathstodon.xyz]
A plot of all roots of all 15th degree polynomials with terms ±1/(n+1)x^n. The roots are tiny blue dots on a white background. They form a ring around the origin at the center of the plot, with something like fractal filigree around the outside of the ring. The roots are symmetric: each quadrant is identical.
November 17, 2025 at 7:42 AM
matthewconroy.mathstodon.xyz.ap.brid.gy
When I want to relax, I like to make animated gifs from Library of Congress stereographs. This is an 1894 photograph by Robert Bonine called "Tired of Play".

#stereograph #photography #blackandwhite #animation #animtedgif
November 16, 2025 at 7:16 AM
matthewconroy.mathstodon.xyz.ap.brid.gy
#noisevember ! I know, my Noisevember tracks haven't been consistently noisy. Then there's this. I built this little box a few years ago with six Schmidt trigger oscillator, just with a single knob to control the pitch of each. Quite noisy by itself. So I […]

[Original post on mathstodon.xyz]
A home-made electronic device with six potentiometer knobs in a row across the top. The power switch is there, too, but it is blurry. Background is a cluttered table top, all pretty blurry.
November 13, 2025 at 7:08 AM
matthewconroy.mathstodon.xyz.ap.brid.gy
I had a good ride today, around the north end of Lake Washington. Stopped at my favorite stopping place around the lake and took my usual picture. There were lots of ducks (along with the always-present cormorants) and two bald eagles showed up and made everyone nervous!

#cycling #bike #birds
A yellow/green bicycle leaning against a fence with a lake right behind. Pilings extend into the distance in the lake, most with a bird sitting on it. There is land across the lake with trees showing fall colors.
November 9, 2025 at 6:39 AM
matthewconroy.mathstodon.xyz.ap.brid.gy
Amanita muscaria in my yard. I've never seen them so big!

#mushroom #mushrooms #fungi
Two large mushrooms with wide, white-dotted, red caps (Amanita muscaria) growing on a leaf-covered ground.
November 8, 2025 at 5:32 AM
matthewconroy.mathstodon.xyz.ap.brid.gy
It's #noisevember ! So here is a two-minute piece of noise made from the roots of all degree 15 Littlewood polynomials (i.e., polynomials with all coefficients equal to ±1). https://soundcloud.com/matthew-m-conroy/noise-from-roots-of-15-th-degree-littlewood-polynomials
A plot of blue points on a white background. The points correspond to the location in the complex plane of all roots of all 15th degree Littlewood polynomials. Sonogram of the sound made from the roots of the 15th degree Littlewood polynomials.
November 2, 2025 at 2:19 AM
matthewconroy.mathstodon.xyz.ap.brid.gy
An almost-November rose on my garbage/holly rose plant.
A close-up photograph of a red rose showing numerous shades of red and multiple petal curves.
October 30, 2025 at 8:44 PM
matthewconroy.mathstodon.xyz.ap.brid.gy
Two new mosaics for my mosaic print series. One made from text from a very old, tiny bible, and the other from text from an old, German art dictionary. Cut up and sorted. https://www.madandmoonly.com/doctormatt/sorted.htm

#art #sorting #mosaic
A square image of text of an old, english-language bible, cut up into squares and then sorts by "darkness", with the darker squares to the left. A mosaic made from a square image of text from an old, german-language art dictionary, cut into small squares and sorted by darkness from left to right.
October 27, 2025 at 6:32 AM
matthewconroy.mathstodon.xyz.ap.brid.gy
My annual birthday self-portrait. Happy Birthday, everyone!

#photo #photography #selfportrait
Self-portrait of an older white man with no hair and circular frame spectacles against a flat background. The photograph is black-and-white.
October 5, 2025 at 6:59 AM
matthewconroy.mathstodon.xyz.ap.brid.gy
@cygnoir Oh, yes, I understand. Carrying notebooks brings a certain comfort for me, too.
A notebook with a red cover and black binding tape. There are a number of stickers on the cover, some circular, some rectangular. The notebook is resting on a metal table.
September 24, 2025 at 6:09 AM
matthewconroy.mathstodon.xyz.ap.brid.gy
I love our garbage roses, their flowers and their thorns.

#bloomscrolljng #rose #Thorns
Close shot of a deep red rose. Close shot of thorns on a rose bush. The thorns are light to medium brown on a green stem. Close shot of thorns on a rose bush. The thorns are mostly a medium brown color on a step of bright green.
September 14, 2025 at 10:13 PM
matthewconroy.mathstodon.xyz.ap.brid.gy
Anyone have any insights into short-term air pollution spikes? Yesterday, this happened in Seattle. We've had moderate smoky air for a week or more, but yesterday there was this spike of much more dense PM2.5. There was no weather happening: no sudden change […]

[Original post on mathstodon.xyz]
Two plots of PM2.5 concentration from a monitor in NE Seattle showing "moderate" air pollution generally and then a spike of much higher concentrated PM 2.5 on 9/5/25. Two plots of air quality and PM2.5 concentration in Cheyenne, Wyoming from 8/30/25 to 9/6/25 showing moderate air quality and then a spike of much higher PM2.5 concentration on 9/4/25.
September 6, 2025 at 10:59 PM
matthewconroy.mathstodon.xyz.ap.brid.gy
It seems I have a walnut tree in my yard. I can't find it. That is, looking at the trees in my yard, I can't find one that is definitely a walnut tree. But I found this on the ground, and I must have come from a tree in my yard. It was under the huge cedar […]

[Original post on mathstodon.xyz]
A walnut fruit showing the walnut shell in a half-sphere of green fruity covering.
August 28, 2025 at 5:07 AM
matthewconroy.mathstodon.xyz.ap.brid.gy
A few years ago, I was walking around my neighborhood and came across some items marked "free" on the sidewalk. One of the items was a nice, old tricycle that I thought would be perfect for my friends daughters. There was also a beautiful old pail full of […]

[Original post on mathstodon.xyz]
A 10 by 10 grid of 100 photographs of clumps of nails, screws and a magnet. Largely neutrally coloured, lots of gray, with some browns due to rust. The clumps cast marked shadows.
August 26, 2025 at 1:04 AM