PhD is in math, not grammar, and there is a possibility English isn't his first language.
As an aside, I looked at the author's thesis because I thought normally (at least at my school) they include a "Vita" that gives the candidates educational experience. This thesis didn't have that, I'm wondering now if it's not a common thing.
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[ 3.5 ms ] story [ 29.9 ms ] threadhttps://repository.upenn.edu/entities/publication/130b7021-2...
As an aside, I looked at the author's thesis because I thought normally (at least at my school) they include a "Vita" that gives the candidates educational experience. This thesis didn't have that, I'm wondering now if it's not a common thing.