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Re:Lisp is not based on the Lambda Calculus by kazinator on Wednesday August 14, 2019 @02:24PM (#20698439)
and (e) mutation: `setq`, `rplacd`, ...
Re:Lisp is not based on the Lambda Calculus by carlehewitt on Wednesday August 14, 2019 @07:04PM (#20700921)
'Setq' and 'rplacd' also do not provide the power of Actors.

See the following:

https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3418003