Add U256 subtraction correctness proofs (17/17 u256)#6
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MarcIlunga wants to merge 1 commit intomainfrom
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Add U256 subtraction correctness proofs (17/17 u256)#6MarcIlunga wants to merge 1 commit intomainfrom
MarcIlunga wants to merge 1 commit intomainfrom
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…tness proofs Completes the U256 subtraction family (17/17 u256 procedures now proven). - sub_with_borrow_be: 770-line chunked proof for the 53-instruction big-endian subtraction with borrow propagation. Follows the same pattern as add_with_carry_be. Includes borrow chain identity, digit extraction, and per-limb correctness lemmas. - overflowing_sub: Composes u256_le_to_be_pair, sub_with_borrow_be, and u256_le_to_be with stack rearrangement. - wrapping_sub: Same as overflowing_sub but drops the borrow flag. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
u256::sub_with_borrow_be,u256::overflowing_sub, andu256::wrapping_subsub_with_borrow_beis a 770-line chunked proof (53 instructions, 8-limb borrow chain), following the same pattern asadd_with_carry_beTest plan
timeout 300s lake build MidenLean.Proofs.U256.SubWithBorrowBepassestimeout 300s lake build MidenLean.Proofs.U256.OverflowingSubpassestimeout 300s lake build MidenLean.Proofs.U256.WrappingSubpasseslake build MidenLeanfull build passes with 0 sorry🤖 Generated with Claude Code