Had this sitting in a NOTEPAD and don’t remember why. I’ll post it and maybe it’ll make sense later what I was researching at the time (a day or two ago) up arrow = increase, mathematical for “undefined”, logical “not both”, logical NAND, Sheffer stroke down arrow = decrease, logical NOR, DOWNWARD relative direction, comma category (category theory), Peirce arrow rightwards arrow = implies, logical consequence, material consequence, =, leftwards arrow = assignment / set / LET A <- 0 / A <- A+1 + = right facing – = left facing

Had this sitting in a NOTEPAD and don’t remember why. I’ll post it and maybe it’ll make sense later what I was researching at the time (a day or two ago)
 
up arrow = increase, mathematical for “undefined”, logical “not both”, logical NAND, Sheffer stroke
down arrow = decrease, logical NOR, DOWNWARD relative direction, comma category (category theory), Peirce arrow
 
rightwards arrow = implies, logical consequence, material consequence, =,
leftwards arrow = assignment / set / LET A <- 0 / A <- A+1
 
+ = right facing
- = left facing
 

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