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| Issue 30: | Sept. 2025 |
| Cheribun, braided: | 54 words |
By Colleen M. Farrelly
Necessary and Sufficient Conditions
In topology, cobordisms relate feature changes between start and end spaces.
water tumbles
over a glacier waterfall
For instance, two circles might merge as they evolve in time.
they link hands
as a brisk breeze
rustles the evergreens
Critically, cobordisms rely on boundaries to define a relationship.
she pulls away
Colleen M. Farrelly
is a mathematician and poet who lives in Miami, Florida, and enjoys being a digital nomad. Her writing has appeared in cattails journal, Contemporary Haibun Online, #FemkuMag, Frogpond, Haibun Today, Modern Haiku, The Other Bunny, under the Bashō, and Wales Haiku Journal among others. Her work has been nominated for Touchstone and Dwarf Star Awards, has won honorable mention in several contests, and appears in telling the bees: The Red Moon Anthology of English-Language Haiku 2024.
Dozens of her papers on computational mathematics have been published, and she’s co-author of two mathematics textbooks: with Yaè Ulrich Gaba, The Shape of Data: Geometry-Based Machine Learning and Data Analysis in R (San Francisco: No Starch Press, 2023); and with Franck Kalala Mutombo, Modern Graph Theory Algorithms with Python (UK: Packt Publishing, 2024).
More on the Web: By, About, and Beyond
⚡ The HMS Situationship, a humorous haibun story by Colleen M. Farrelly in cattails journal (April 2021), selected as an Editor’s Choice Haibun; see page 137 of the April issue.
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