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Celebratio Mathematica

Abigail A. Thompson

Brief reflections from a student of Thompson

by George Mossessian

Among the many ment­ors and teach­ers who might have shaped my idea of the Ar­is­toteli­an good life, only two bod­hisat­tvas have made any last­ing im­pres­sion — my col­lege fen­cing mas­ter, John Main­zer, and my PhD ad­visor, Abby Thompson.

I met Abby in 2011, my first year at the Uni­versity of Cali­for­nia, Dav­is, after a sud­den real­iz­a­tion that I did not in fact want to study math­em­at­ic­al phys­ics. This know­ledge struck me in the middle of a com­pu­ta­tion, some purely peri­pat­et­ic pro­pos­i­tion about trans­port­ing vec­tor bundles along the con­form­al bound­ary of a space with, of all things, two time vec­tors. “Who could ever have need of such a thing?” I thought. Later, when I was com­par­ing framed link sur­gery dia­grams in Abby’s of­fice, that same ques­tion some­how didn’t oc­cur to me.

Prob­ably it didn’t do so be­cause of Abby’s uniquely hu­mane ap­proach to math­em­at­ics and math­em­aticians. Many of us learn to feel that our worth as a per­son is tied dir­ectly to our math­em­at­ic­al abil­ity. For some, this il­lu­sion per­sists well in­to their ca­reers, but for most, it even­tu­ally be­comes ne­ces­sary to un­learn this. Abby, I sense, nev­er sub­scribed to such an ideo­logy. We of­ten spoke of math, wheth­er my own work, hers, or someone else’s, but just as of­ten we veered in­to mu­sic, lit­er­at­ure, edu­ca­tion, or per­son­al mat­ters, and none of these ever seemed less im­port­ant, in­ter­est­ing, or in­spir­ing than the oth­ers. A course was nev­er pre­scribed in our con­ver­sa­tions, not even a re­search dir­ec­tion, ini­tially a source of frus­tra­tion for me. But of course, math is just like any­thing else worth spend­ing a life­time on; it’s a game, a slow jour­ney of dis­cov­ery of the self as much as of any fun­da­ment­al truth, and Abby un­der­stood that that game can­not be played without learn­ing to find your own path.

I left aca­demia after fin­ish­ing my de­gree, a dif­fi­cult de­cision that I some­times still re­gret, but that does not mean my time was ill-spent. I may have learned some to­po­logy with Abby, and sub­sequently for­got­ten most of it, but I also learned that the fabled blind men who feel the in­di­vidu­al parts of the ele­phant are in fact all cor­rect. A per­son may be a math­em­atician, and may also be an edu­cat­or, an out­spoken thinker, a mu­si­cian, a moth­er, a writer, an ob­serv­er of nud­ibranchs.1 It is not that none of these is the whole by it­self, but that each of these is a whole in it­self. A fit­ting les­son, giv­en my dis­ser­ta­tion top­ic of com­mon sta­bil­iz­a­tions of Hee­gaard split­tings — to ac­com­mod­ate the wholes of a fel­low trav­el­er, one has only to in­crease one’s genus.

George Mosses­si­an stud­ied with Abby Thompson as a gradu­ate stu­dent from 2011–2016.