6.14. Ďaląie typy matematických písiem

$\Cal A, \dots, \Cal Z$\Cal A \dots \Cal Z
$\Bbb A, \Bbb R, \Bbb N, \dots, \Bbb Z$\Bbb A, \Bbb R, \Bbb N, \dots, \Bbb Z
$\frak A, \dots, \frak Z$\frak A, \dots, \frak Z