Okay, so maybe for you advanced people out there, this is just "plain as day"
but for me, this is pretty hard to interpret, and I bet other people also have to sit there when they see this kind of stuff and say "uhm, math, please, in ENGLISH?"
So what I want to say is (so that I never waste time googling this again)... that "upside-down A" means "for all"
So lets read this in English.
Line one: the function of y_1 and y_2 is greater than or equal to zero FOR ALL values of y_1 and y_2
... Line 2 later.. just realized I'm late to class. Egads.
I hate it when authors use excessive and/or unnecessary mathematical symbols. The "for all" symbol is an obnoxious example of this.
ReplyDeleteLine 2 isn't quite so bad -- it just means that f(y_1,y_2) is normalized (in the physicist's sense that something sums or integrates to 1).
why thank you! yes double integrals look intimidating, or at least like the letter "s" in german.
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