| Constant || Mnemonic
| ||How I like a drink, alcoholic of course, after the heavy lectures involving quantum mechanics.
Days in Month (Gregorian Calendar)
30 days hath September,
April, June and November,
All the rest have 31,
Excepting February alone
(And that has 28 days clear,
With 29 in each leap year).
Graphical Set-Based Representation of Logical Operators
| Type || Usage || Latex Equivalents
| italics without kerning and ligature rules || used for variables || automatically in math mode
| upright roman || abbreviations of operators, function names ||
| sans-serif and typewriter || not used except sometimes for special meaning ||
| math blackboard bold (calligraphic) || used mostly for sets ||