Hi there, I am trying to calculate preconditions of operations in Z using ProofPower. But after strip and rewriting, I can not be able to current goal. (see attached file) I am not pretty sure of which steps should I take to achieve the goal. Maybe I am not using the correct witnesses in the z_E_tac, in the beginning of the proof.
Could someone guide me through this please? Cheers, -- Artur Oliveira Gomes
Description: MS-Word document
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