[msla]

> Is there any specific recomendations for: "Meanwhile, you can give people a real understanding of basic quantum mechanics with high-school algebra and a bit of simple logic"?

I had "Quantum Mechanics: The Theoretical Minimum" in mind, but I forgot it used some simple calculus, too. It's easy enough to bootstrap from high-school algebra to the kind of calculus it uses, but my statement wasn't correct for that book.

But I'm being unfair: The volume on quantum mechanics is the second volume, and both differentiation and integration are explicitly explained in the first, on classical mechanics.

And there's a difference between using an equation and deriving it. If you don't expect to derive equations, you can still understand quantum mechanics in terms of state vectors, matrix operators, and complex amplitudes turning into probabilities without explicitly using a Lagrangian, which does unavoidably require calculus.

(And, yes, I consider basic matrix algebra and complex numbers to be high school algebra.)