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Exact tridiagonal solve: schur diagonal update · case 03
The exact exact tridiagonal solve result violates the stated contract at schur diagonal update.
Case contract
Input [lower,diag,upper,rhs] integer tridiagonal system with nonzero Thomas pivots; return rational solution [p,q] per coordinate.
Why this case matters
Exact discrete arithmetic with observable algorithmic state; no floating point approximation is used.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| explicit oracle 0 | [[-71, 102], [14, 17]] | [[-27, 38], [14, 19]] | Failed |
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