The Traditional Square of Opposition (Stanford Encyclopedia of Philosophy)

Immanuel Kant: Logic Internet Encyclopedia of Philosophy

Full article: Was Lewis Carroll an Amazing Oppositional Geometer?

PDF) Why the Logical Hexagon? Alessio Moretti

СЕМИОТИЧЕСКИЙ КВАДРАТ И АНТИНОМИИ КАК ИНСТРУМЕНТЫ

Square of Opposition Internet Encyclopedia of Philosophy

Traditional Square of Opposition

Full article: Was Lewis Carroll an Amazing Oppositional Geometer?

Formal Logic

Logical Oppositions in Arabic Logic: Avicenna and Averroes

The traditional version of the Square of Opposition

Descartes' Method (Stanford Encyclopedia of Philosophy)

Negation (Stanford Encyclopedia of Philosophy)

Full article: Was Lewis Carroll an Amazing Oppositional Geometer?