what is the difference between internal logic and external logic?
INTERNAL AND EXTERNAL LOGIC In an essential way I make use of Fregeâs and Vasilevâs ideas. N. A. Vasilev distinguished two levels in a logic. The abstract (external) logic depends on gnoeologic assumptions while the empirical (internal) part of logic depends on ontological ones. Vasilev did not change the external logic but he did change the internal one. His system can be viewed as a non-standard syllogistics based on classical propositional logic (see [5], [6]).