Textbook of AI

1915–1975, Logician, philosopher of language

Yehoshua Bar-Hillel was an Austrian-Israeli logician and one of the founders of computational linguistics. From 1951 he was the first full-time researcher in machine translation, organising the first international MT conference at MIT in 1952. His 1959 report The Present Status of Automatic Translation of Languages argued that fully automatic high-quality machine translation was impossible in principle without world knowledge, a position vindicated by the 1966 ALPAC report which ended the early MT funding boom.

His celebrated illustrative example, the sentence "the box is in the pen" requires the reader to infer that "pen" here means a playpen rather than a writing instrument, an inference that depends on knowing that boxes are typically larger than writing pens, became a standard demonstration of the knowledge problem in AI. The position was contested, but the broad point, that natural language understanding requires more than syntactic and lexical processing, has been confirmed many times since, and indirectly motivates everything from CYC to the world-knowledge capabilities of modern large language models.