L20) Inference

**Grammatical inference**: the ultimate challenge. Impossible (Gold), hard as cracking RSA, it is the extreme case of recognition. Learning is compressing.

L16) The Paradox of Bidirectionality

Despite 50 years, bidirectionality in reversible grammars remains rare. Discover why asymmetry is structural and requires a declarative approach in NLP.

L16) The Paradox of Bidirectionality

Despite 50 years, bidirectionality in reversible grammars remains rare. Discover why asymmetry is structural and requires a declarative approach in NLP.

L16) The Paradox of Bidirectionality

Reversible grammars are 50 years old. Why isn’t bidirectionality adopted? This article explores the structural reasons for this persistent asymmetry.