Fitch Proofs for Construction Logic
A construction decision often depends on clear conditions. A permit may require a survey. A concrete pour may require inspection. A lift plan may require certified equipment. Fitch logic helps teams write these conditions as exact statements. Each line is checked by a rule. Each cited line must be available. Each temporary assumption must stay inside its proper scope.
Why This Calculator Helps
This calculator gives a structured proof review. It accepts premises, a target conclusion, and proof lines. The checker studies formula shape, rule names, cited references, and subproof ranges. It also reports missing premises, invalid citations, depth jumps, and conclusion mismatch. The result is useful for documentation, and quality checks.
Construction Use Cases
The tool can model jobsite reasoning. For example, if a slab is inspected and inspected work may proceed, then work may proceed. If either temporary bracing is approved or engineered shoring is approved, and both paths justify access, then access is justified. These examples are not legal opinions. They are logic tests that make reasoning visible.
Proof Scope
Fitch proofs use boxes. A box starts with an assumption. Lines inside that box can depend on it. When the box closes, the assumption is discharged by a rule. Conditional introduction is a common case. If assuming A leads to B, the closed proof supports A implies B. The calculator checks this pattern using ranges such as 3-6.
Advanced Checking
Strict scope mode blocks references to hidden lines. This helps prevent a common proof error. A line inside a closed assumption should not support a later main proof line unless a discharge rule permits it. The checker also normalizes symbols. You may type arrows, conjunctions, negations, or plain keyboard versions.
Export And Review
CSV export helps teams keep line results in a spreadsheet. The report download gives a compact review record. It includes the project name, reviewer, premises, conclusion, score, and line feedback. Use these exports during design reviews and classroom demonstrations.
Good Practice
Write short atoms. Use names like PermitApproved, SurveyComplete, or AccessAllowed. Keep one idea per atom. Cite only earlier lines. Enter depth numbers carefully. Review every warning. A valid proof is only as useful as the premises behind it.