Mnemonics

Constant	Mnemonic
$\pi$	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

Fonts

Type	Usage	Latex Equivalents
italics without kerning and ligature rules	used for variables	automatically in math mode
upright roman	abbreviations of operators, function names	`\mathrm`
sans-serif and typewriter	not used except sometimes for special meaning	`\mathtt`
math blackboard bold (calligraphic)	used mostly for sets	`\mathbb`

Divisibility

by $2$ , last digit in a number is divisible by $2$ ,
by $3$ , the result of all digits summed up in a number is divisible by $3$ ,
by $4$ , last two digits in a number form a smaller number that has to be divisible by $4$ ,
by $5$ , last digit divisible by $5$ ,
by $10$ , number ends in $0$

Table of Contents

Mnemonics

Days in Month (Gregorian Calendar)

Graphical Set-Based Representation of Logical Operators

Fonts

Divisibility

Index