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Comment by dmvdoug | Hacker News Reader

Can someone please help me parse this sentence?

> Brownian motion and Itô calculare a notable example of fairly high-level mathematics that are applied to model the real world

What is “Itô calculare” supposed to have been? I am stumped. “Its calculation”?

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Itô is the name of the type of calculus (https://en.wikipedia.org/wiki/It%C3%B4_calculus) and calculare I think is just the plural of calculus. So something like "all the itô calculus are notable examples of fairly high level mathematics ..."

The plural of calculus is calculi or calculuses. Calculare might be an autocorrection for a different language (https://en.wiktionary.org/wiki/calculare), though given that the author has a Korean name, it’s more likely just a weird typo.

That makes so much more sense! Although the pedant in me wants to argue that calculus plural is “calculi”/“calculuses” (the dictionary gives me the latter, although I’ve never seen it in the wild myself—-but I won’t pursue that because it’s beside the point!) Thanks for the help!

It's a typo. "calculare" is supposed to be "calculus are"

Typo.

-> and Itô calculus are a notable

I think it's a reference to Itô Calculus

https://en.wikipedia.org/wiki/It%C3%B4_calculus

Ito calculus - https://en.wikipedia.org/wiki/It%C3%B4_calculus

the article goes into the details in https://jiha-kim.github.io/posts/introduction-to-stochastic-... but the TLDR is it's a way to define integration of random walks.

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