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On the Expressive Power of Programming Languages by Shriram Krishnamurthi [PWLConf 2019]
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Shriram Krishnamurthi's PWLConf 2019 talk on the formal notion of expressive power of programming languages, based on Felleisen's paper. It explains how to tell when a feature adds power by whether emulating it requires global rewriting.
Recommended as the approachable way into a precise definition of language expressiveness for language-design arguments.
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