One relatively minor frustration is that the copy editors have substituted ·, the symbol for the dot-product (an element-wise product vector sum); for ◦, the symbol for a Hadamard (element-wise matrix product). This was correct on the final version of the manuscript but I stupidly missed it in the proofs (to be fair, there were quite a few copy errors in that version). This probably does not merit a correction because I define the use of · in the text, and then it is consistent throughout. Still, slightly annoying. Oh well!
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