**The Algorithmic Beauty of Plants** — “The idea of form implicitly contains also the history of such a form.”

**Part, Site, Analysis** — Notes on Casati and Varzi’s book, “Parts and places: the structures of spatial representation” (MIT Press).

**On Naming** — “A proper name, when one meets with it for the first time, is existentially connected with some percept or other equivalent individual knowledge of the

**Like As Not** — Metaphor implies repetition with a difference. A catalog might then also be an extended metaphor.

**Obituaries: Cathleen Morawetz (1923-2017)** — In the mathematics of flows and shocks, Cathleen Morawetz, Olga Ladyzhenskaya, and Olga Oleinik together form a singular legacy, an interconnected legacy (Early Memories of

**Obituaries: Maryam Mirzakhani (1977 - 2017)** — Maryam Mirzakhani died today.

**A fearful sphere, whose center is everywhere** — In a beautiful article, The Mathematics of Doodling, Ravi Vakil poses two problems:

**2-butterfly derangement** — The hallmark of the Cooley-Tukey algorithm for Fast Fourier Transform is the butterfly network, which helps reduce $O(n^2)$ computations to $O(n log n)$. Butterflies are

**Maximum weighted independent set - connected component** — Given a weighted connected component, what is the weight of the maximum independent set, and how many different sets have this weight? A Petersen graph

**Maximum weighted independent set - singletons and forest** — Gus wants to open franchises of his restaurant, Los Pollos Hermanos, along Central Avenue. There are $n$ possible locations for franchises, where location i is

**Rational numbers in decimal** — In decimal representation, rational numbers either terminate after a finite number of digits or produce a repeating sequence. Conversely, any repeating decimal can be converted

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