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, , and Non-Permutability of -Steps
2012
Journal of symbolic computation
Using a human-oriented formal example proof of the (lim+) theorem, i.e. that the sum of limits is the limit of the sum, which is of value for reference on its own, we exhibit a non-permutability of beta-steps and delta+-steps (according to Smullyan's classification), which is not visible with non-liberalized delta-rules and not serious with further liberalized delta-rules, such as the delta++-rule. Besides a careful presentation of the search for a proof of (lim+) with several pedagogical
doi:10.1016/j.jsc.2011.12.035
fatcat:g2uh2ml62zgi7bnoffo74dczgi