Compare this with how Ada/SPARK handles contracts. In SPARK, contracts are verified statically by a formal proof engine using SMT solvers (CVC4/Z3). The toolchain proves, at compile time, that preconditions are always satisfied by all callers. If it can’t prove it, the code doesn’t pass review. There’s no “observe and continue” — you fix the proof or you don’t ship. C++ contracts are runtime checks with optional enforcement. SPARK contracts are compile-time proofs with mandatory satisfaction. These aren’t the same category of tool.
The upper-right tells us which menu mode we're in; this is the standard / menu. Set-Width does what it says in line two of the menu (See? It's a nice feature!). Column-Range does the same thing, except for multiple columns at once.For some reason, under the : menu, Set-Width functions are duplicated but altered to combine two / menu options.That's not to say the add-in isn't useful for cell styling, or placing graphs into a worksheet directly. Making documents look nice is important after all. The boss needs to be impressed with those Q3 projection charts, even when they forecast doom. Especially then, probably!
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We translated this to approximately 25k lines of Lean code21 (≈ 3 person-months of work22) and about 215k lines of Rocq isomorphism proofs (≈ 2.5 person-years of work).
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