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this is the context, it is necessarily contextual as opposed to being lexical. The old idiom is using var self = this; in the preamble of a function that wishes to expose it's context to functions it defines. The current idiom is using arrow functions whose context is their parent's context
It isn't really notation so much as a recording of the 3 states each of the pieces goes through (each piece is equilibrated n times for when the other block is split into n pieces, so I record the state of the piece after each of it's equilibrations), expressed as how much of the maximum temperature the piece has (I suppose it would have been cleaner if I'd included the implicit initial states of 0 for the blue pieces, and 1 for the red pieces)
Divide both clay blocks into n pieces
For each piece of blue, equalize it with each piece of red in turn, from coldest to warmest
The first red piece will be 100*(1/2^n)
The last red piece will be 50
The best I've done in my head is to get red down to a bit below 25, at 5x5, but a spreadsheet I just rolled up says blue passes above 90 at 32x32
I may have made an error of course, but breaking down the 3x3 case (and expressing T and fractions of 100)
B1 1/2, 3/4, 7/8
B2 1/4, 1/2, 11/16
B3 1/8, 5/16, 1/2
R1 1/2, 1/4, 1/8
R2 3/4, 1/2, 5/16
R3 7/8, 11/16, 1/2
And recombining gets us R 5/16, B 11/16
As far as I can tell, you can push the temperature of blue arbitrarily close to 100, and the temperature of red arbitrarily close to 0. Am I missing something, as this seems substantially better than the other answers
Can't you do better by splitting both blocks up, and doing equilibrating each piece of blue with each piece of red, in turn? By not dividing blue, you are leaving the red pieces a lot warmer than necessary
The suggestion of wearing cloth masks is not to protect the wearer, but to reduce the radius of spread from those who are infected but asymptomatic. In this case, of course the masks themselves constitute fomites, but the person wearing them is already infected. Macintyre addresses use of cloth masks by hospital workers to protect themselves from patients, which is a use case extremely sensitive to the masks acting as fomites and infecting the person wearing them