Ancient Greek Logic: Aristotle Beginning Modern Logic: Leibniz Scientific articles on formal aspects of Ancient Western and Indian Logic © Klaus Glashoff Medieaval Indian Logic: Dignaga Quotation of the day: "Logic, with mathematics, might be compared to a fine net which is cast into immense abyss of phenomena in order to cath the pearls that are scientific syntheses. It is a powerful instrument of research, but an instrument only." Jan Lukasiewicz