This is fantastic, although the statement about the intended audience cracked me up a bit: "intended for a general audience including ... anyone interested in a concise intro/overview of QM. Prerequisites: linear algebra, calculus, ..."
The PDF is essentially higher math with QM-related narrative interspersed here and there. Even if you're a STEM graduate, I found that these skills atrophy pretty quickly if you're not using them day-to-day in your work. Scientists often vastly overestimate how conversant their readers are with "obvious" prerequisites such as vector calculus.
And you can often tell on HN, because you have a thread where two mathematicians chat with each other, and then everyone else is just relating anecdotes about quantum mechanics.
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