13 Characters  13.1 Character Concepts 13.1.4 Character Categories 13.1.4.3 Characters With Case
13.1.4.3.2 Lowercase CharactersA lowercase character is one that has a corresponding uppercase character that is different (and can be obtained using char-upcase).Of the standard characters, only these are lowercase characters: a b c d e f g h i j k l m n o p q r s t u v w x y z |