FA-15416 / Numerics / Open access

Exact tridiagonal solve: initial upper normalization · case 01

The exact exact tridiagonal solve result violates the stated contract at initial upper normalization.

Verified by executionVariant 1 · 8 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The initial upper normalization step uses c[0] instead of c[0]/den.

VERIFIED REPAIR

Use c[0]/den at the initial upper normalization step.

Unsuccessful approach: The partial repair c[0]*den still violates the initial upper normalization invariant.

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.

1 / The failure

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json
import math
import itertools
from fractions import Fraction
N = 1
observations = []
def solve(x):
    low,d,up,b=x;n=len(d)
    c=list(map(Fraction,up));r=list(map(Fraction,b));den=Fraction(d[0])
    if not den:return None
    if c:c[0]=c[0]
    r[0]=r[0]/den
    for i in range(1,n):
     den=d[i]-low[i-1]*c[i-1]
     if not den:return None
     if i<n-1:c[i]/=den
     r[i]=(r[i]-low[i-1]*r[i-1])/den
    for i in range(n-2,-1,-1):r[i]=r[i]-c[i]*r[i+1]
    return [[v.numerator,v.denominator] for v in r]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[([[-1], [6, 6], [2], [-3, -5]], [[-4, 19], [-33, 38]]), ([[-2, -2, -1, -2, -2], [6, 6, 6, 6, 6, 6], [0, 0, 1, -2, -1], [3, -2, 5, -3, -2, -4]], [[1, 2], [-1, 6], [487, 557], [-968, 1671], [-376, 557], [-1490, 1671]]), ([[2], [6, 6], [2], [2, 2]], [[1, 4], [1, 4]]), ([[2], [6, 6], [-1], [-5, 3]], [[-27, 38], [14, 19]]), ([[1], [6, 6], [-1], [-5, -5]], [[-35, 37], [-25, 37]]), ([[1], [6, 6], [0], [-2, 4]], [[-1, 3], [13, 18]]), ([[1], [6, 6], [2], [-1, 4]], [[-7, 17], [25, 34]]), ([[-1], [6, 6], [-1], [4, 5]], [[29, 35], [34, 35]])], [([[2], [6, 6], [2], [2, 2]], [[1, 4], [1, 4]]), ([[1], [6, 6], [-1], [-5, -5]], [[-35, 37], [-25, 37]]), ([[-1], [6, 6], [2], [-3, -5]], [[-4, 19], [-33, 38]]), ([[-2, -2, -1, -2, -2], [6, 6, 6, 6, 6, 6], [0, 0, 1, -2, -1], [3, -2, 5, -3, -2, -4]], [[1, 2], [-1, 6], [487, 557], [-968, 1671], [-376, 557], [-1490, 1671]]), ([[2], [6, 6], [2], [2, 3]], [[3, 16], [7, 16]]), ([[-2], [6, 6], [2], [1, 1]], [[1, 10], [1, 5]]), ([[0], [6, 6], [1], [0, -1]], [[1, 36], [-1, 6]]), ([[-1], [6, 6], [1], [5, 1]], [[29, 37], [11, 37]])], [([[2], [6, 6], [-1], [-5, 3]], [[-27, 38], [14, 19]]), ([[0], [6, 6], [-1], [4, 3]], [[3, 4], [1, 2]]), ([[-1], [6, 6], [2], [-3, -5]], [[-4, 19], [-33, 38]]), ([[-2, -2, -1, -2, -2], [6, 6, 6, 6, 6, 6], [0, 0, 1, -2, -1], [3, -2, 5, -3, -2, -4]], [[1, 2], [-1, 6], [487, 557], [-968, 1671], [-376, 557], [-1490, 1671]]), ([[2], [6, 6], [0], [0, 4]], [[0, 1], [2, 3]]), ([[-2], [6, 6], [0], [3, -4]], [[1, 2], [-1, 2]]), ([[0], [6, 6], [0], [1, -2]], [[1, 6], [-1, 3]]), ([[-2], [6, 6], [1], [5, 2]], [[14, 19], [11, 19]])], [([[1], [6, 6], [-1], [-5, -5]], [[-35, 37], [-25, 37]]), ([[-1], [6, 6], [-1], [1, 2]], [[8, 35], [13, 35]]), ([[-1], [6, 6], [2], [-3, -5]], [[-4, 19], [-33, 38]]), ([[-2, -2, -1, -2, -2], [6, 6, 6, 6, 6, 6], [0, 0, 1, -2, -1], [3, -2, 5, -3, -2, -4]], [[1, 2], [-1, 6], [487, 557], [-968, 1671], [-376, 557], [-1490, 1671]]), ([[0, -1], [6, 6, 6], [2, 1], [5, -2, 4]], [[217, 222], [-16, 37], [22, 37]]), ([[-1, -1], [6, 6, 6], [0, -1], [0, -3, -1]], [[0, 1], [-19, 35], [-9, 35]]), ([[-2, 0], [6, 6, 6], [0, -1], [-3, -5, 3]], [[-1, 2], [-11, 12], [1, 2]]), ([[1, 0], [6, 6, 6], [-1, 0], [-3, -3, 5]], [[-21, 37], [-15, 37], [5, 6]])], [([[1], [6, 6], [2], [-1, 4]], [[-7, 17], [25, 34]]), ([[0], [6, 6], [-1], [4, 3]], [[3, 4], [1, 2]]), ([[-1], [6, 6], [2], [-3, -5]], [[-4, 19], [-33, 38]]), ([[-2, -2, -1, -2, -2], [6, 6, 6, 6, 6, 6], [0, 0, 1, -2, -1], [3, -2, 5, -3, -2, -4]], [[1, 2], [-1, 6], [487, 557], [-968, 1671], [-376, 557], [-1490, 1671]]), ([[-1, 2], [6, 6, 6], [-2, 1], [5, 3, -4]], [[107, 96], [27, 32], [-91, 96]]), ([[-2, 2], [6, 6, 6], [-2, 2], [2, -2, 0]], [[5, 21], [-2, 7], [2, 21]]), ([[-2, 1], [6, 6, 6], [0, 2], [4, 4, 2]], [[2, 3], [14, 17], [10, 51]]), ([[1, -1], [6, 6, 6], [-2, 0], [-5, -4, 0]], [[-1, 1], [-1, 2], [-1, 12]])]]
for i, (args, expected) in enumerate(fixtures[N-1]):
    check("explicit oracle %d" % i, solve(args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)

Boundary fixture	Actual	Expected	Outcome
explicit oracle 0	`[[7, 8], [-11, 16]]`	`[[-4, 19], [-33, 38]]`	Failed
explicit oracle 1	`[[1, 2], [-1, 6], [487, 557], [-968, 1671], [-376, 557], [-1490, 1671]]`	`[[1, 2], [-1, 6], [487, 557], [-968, 1671], [-376, 557], [-1490, 1671]]`	Passed
explicit oracle 2	`[[-1, 1], [2, 3]]`	`[[1, 4], [1, 4]]`	Failed
explicit oracle 3	`[[-1, 4], [7, 12]]`	`[[-27, 38], [14, 19]]`	Failed
explicit oracle 4	`[[-10, 7], [-25, 42]]`	`[[-35, 37], [-25, 37]]`	Failed
explicit oracle 5	`[[-1, 3], [13, 18]]`	`[[-1, 3], [13, 18]]`	Passed
explicit oracle 6	`[[-9, 4], [25, 24]]`	`[[-7, 17], [25, 34]]`	Failed
explicit oracle 7	`[[9, 5], [17, 15]]`	`[[29, 35], [34, 35]]`	Failed

SHA-256 / e611be05ee97d2945f21a0357813691f692fe190e95db5239a2dcc7225ebded6

2 / The unsuccessful fix

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json
import math
import itertools
from fractions import Fraction
N = 1
observations = []
def solve(x):
    low,d,up,b=x;n=len(d)
    c=list(map(Fraction,up));r=list(map(Fraction,b));den=Fraction(d[0])
    if not den:return None
    if c:c[0]=c[0]*den
    r[0]=r[0]/den
    for i in range(1,n):
     den=d[i]-low[i-1]*c[i-1]
     if not den:return None
     if i<n-1:c[i]/=den
     r[i]=(r[i]-low[i-1]*r[i-1])/den
    for i in range(n-2,-1,-1):r[i]=r[i]-c[i]*r[i+1]
    return [[v.numerator,v.denominator] for v in r]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[([[-1], [6, 6], [2], [-3, -5]], [[-4, 19], [-33, 38]]), ([[-2, -2, -1, -2, -2], [6, 6, 6, 6, 6, 6], [0, 0, 1, -2, -1], [3, -2, 5, -3, -2, -4]], [[1, 2], [-1, 6], [487, 557], [-968, 1671], [-376, 557], [-1490, 1671]]), ([[2], [6, 6], [2], [2, 2]], [[1, 4], [1, 4]]), ([[2], [6, 6], [-1], [-5, 3]], [[-27, 38], [14, 19]]), ([[1], [6, 6], [-1], [-5, -5]], [[-35, 37], [-25, 37]]), ([[1], [6, 6], [0], [-2, 4]], [[-1, 3], [13, 18]]), ([[1], [6, 6], [2], [-1, 4]], [[-7, 17], [25, 34]]), ([[-1], [6, 6], [-1], [4, 5]], [[29, 35], [34, 35]])], [([[2], [6, 6], [2], [2, 2]], [[1, 4], [1, 4]]), ([[1], [6, 6], [-1], [-5, -5]], [[-35, 37], [-25, 37]]), ([[-1], [6, 6], [2], [-3, -5]], [[-4, 19], [-33, 38]]), ([[-2, -2, -1, -2, -2], [6, 6, 6, 6, 6, 6], [0, 0, 1, -2, -1], [3, -2, 5, -3, -2, -4]], [[1, 2], [-1, 6], [487, 557], [-968, 1671], [-376, 557], [-1490, 1671]]), ([[2], [6, 6], [2], [2, 3]], [[3, 16], [7, 16]]), ([[-2], [6, 6], [2], [1, 1]], [[1, 10], [1, 5]]), ([[0], [6, 6], [1], [0, -1]], [[1, 36], [-1, 6]]), ([[-1], [6, 6], [1], [5, 1]], [[29, 37], [11, 37]])], [([[2], [6, 6], [-1], [-5, 3]], [[-27, 38], [14, 19]]), ([[0], [6, 6], [-1], [4, 3]], [[3, 4], [1, 2]]), ([[-1], [6, 6], [2], [-3, -5]], [[-4, 19], [-33, 38]]), ([[-2, -2, -1, -2, -2], [6, 6, 6, 6, 6, 6], [0, 0, 1, -2, -1], [3, -2, 5, -3, -2, -4]], [[1, 2], [-1, 6], [487, 557], [-968, 1671], [-376, 557], [-1490, 1671]]), ([[2], [6, 6], [0], [0, 4]], [[0, 1], [2, 3]]), ([[-2], [6, 6], [0], [3, -4]], [[1, 2], [-1, 2]]), ([[0], [6, 6], [0], [1, -2]], [[1, 6], [-1, 3]]), ([[-2], [6, 6], [1], [5, 2]], [[14, 19], [11, 19]])], [([[1], [6, 6], [-1], [-5, -5]], [[-35, 37], [-25, 37]]), ([[-1], [6, 6], [-1], [1, 2]], [[8, 35], [13, 35]]), ([[-1], [6, 6], [2], [-3, -5]], [[-4, 19], [-33, 38]]), ([[-2, -2, -1, -2, -2], [6, 6, 6, 6, 6, 6], [0, 0, 1, -2, -1], [3, -2, 5, -3, -2, -4]], [[1, 2], [-1, 6], [487, 557], [-968, 1671], [-376, 557], [-1490, 1671]]), ([[0, -1], [6, 6, 6], [2, 1], [5, -2, 4]], [[217, 222], [-16, 37], [22, 37]]), ([[-1, -1], [6, 6, 6], [0, -1], [0, -3, -1]], [[0, 1], [-19, 35], [-9, 35]]), ([[-2, 0], [6, 6, 6], [0, -1], [-3, -5, 3]], [[-1, 2], [-11, 12], [1, 2]]), ([[1, 0], [6, 6, 6], [-1, 0], [-3, -3, 5]], [[-21, 37], [-15, 37], [5, 6]])], [([[1], [6, 6], [2], [-1, 4]], [[-7, 17], [25, 34]]), ([[0], [6, 6], [-1], [4, 3]], [[3, 4], [1, 2]]), ([[-1], [6, 6], [2], [-3, -5]], [[-4, 19], [-33, 38]]), ([[-2, -2, -1, -2, -2], [6, 6, 6, 6, 6, 6], [0, 0, 1, -2, -1], [3, -2, 5, -3, -2, -4]], [[1, 2], [-1, 6], [487, 557], [-968, 1671], [-376, 557], [-1490, 1671]]), ([[-1, 2], [6, 6, 6], [-2, 1], [5, 3, -4]], [[107, 96], [27, 32], [-91, 96]]), ([[-2, 2], [6, 6, 6], [-2, 2], [2, -2, 0]], [[5, 21], [-2, 7], [2, 21]]), ([[-2, 1], [6, 6, 6], [0, 2], [4, 4, 2]], [[2, 3], [14, 17], [10, 51]]), ([[1, -1], [6, 6, 6], [-2, 0], [-5, -4, 0]], [[-1, 1], [-1, 2], [-1, 12]])]]
for i, (args, expected) in enumerate(fixtures[N-1]):
    check("explicit oracle %d" % i, solve(args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)

Boundary fixture	Actual	Expected	Outcome
explicit oracle 0	`[[19, 6], [-11, 36]]`	`[[-4, 19], [-33, 38]]`	Failed
explicit oracle 1	`[[1, 2], [-1, 6], [487, 557], [-968, 1671], [-376, 557], [-1490, 1671]]`	`[[1, 2], [-1, 6], [487, 557], [-968, 1671], [-376, 557], [-1490, 1671]]`	Passed
explicit oracle 2	`[[11, 9], [-2, 27]]`	`[[1, 4], [1, 4]]`	Failed
explicit oracle 3	`[[13, 18], [7, 27]]`	`[[-27, 38], [14, 19]]`	Failed
explicit oracle 4	`[[-35, 12], [-25, 72]]`	`[[-35, 37], [-25, 37]]`	Failed
explicit oracle 5	`[[-1, 3], [13, 18]]`	`[[-1, 3], [13, 18]]`	Passed
explicit oracle 6	`[[49, 6], [-25, 36]]`	`[[-7, 17], [25, 34]]`	Failed
explicit oracle 7	`None`	`[[29, 35], [34, 35]]`	Failed

SHA-256 / c96413fe33dfd903bb856516e60dbb36157967e1653b6e6ed4211c8670736d17

3 / The verified repair

Exit 0

"""Failure Map reference implementation. Python standard library only."""
import json
import math
import itertools
from fractions import Fraction
N = 1
observations = []
def solve(x):
    low,d,up,b=x;n=len(d)
    c=list(map(Fraction,up));r=list(map(Fraction,b));den=Fraction(d[0])
    if not den:return None
    if c:c[0]=c[0]/den
    r[0]=r[0]/den
    for i in range(1,n):
     den=d[i]-low[i-1]*c[i-1]
     if not den:return None
     if i<n-1:c[i]/=den
     r[i]=(r[i]-low[i-1]*r[i-1])/den
    for i in range(n-2,-1,-1):r[i]=r[i]-c[i]*r[i+1]
    return [[v.numerator,v.denominator] for v in r]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[([[-1], [6, 6], [2], [-3, -5]], [[-4, 19], [-33, 38]]), ([[-2, -2, -1, -2, -2], [6, 6, 6, 6, 6, 6], [0, 0, 1, -2, -1], [3, -2, 5, -3, -2, -4]], [[1, 2], [-1, 6], [487, 557], [-968, 1671], [-376, 557], [-1490, 1671]]), ([[2], [6, 6], [2], [2, 2]], [[1, 4], [1, 4]]), ([[2], [6, 6], [-1], [-5, 3]], [[-27, 38], [14, 19]]), ([[1], [6, 6], [-1], [-5, -5]], [[-35, 37], [-25, 37]]), ([[1], [6, 6], [0], [-2, 4]], [[-1, 3], [13, 18]]), ([[1], [6, 6], [2], [-1, 4]], [[-7, 17], [25, 34]]), ([[-1], [6, 6], [-1], [4, 5]], [[29, 35], [34, 35]])], [([[2], [6, 6], [2], [2, 2]], [[1, 4], [1, 4]]), ([[1], [6, 6], [-1], [-5, -5]], [[-35, 37], [-25, 37]]), ([[-1], [6, 6], [2], [-3, -5]], [[-4, 19], [-33, 38]]), ([[-2, -2, -1, -2, -2], [6, 6, 6, 6, 6, 6], [0, 0, 1, -2, -1], [3, -2, 5, -3, -2, -4]], [[1, 2], [-1, 6], [487, 557], [-968, 1671], [-376, 557], [-1490, 1671]]), ([[2], [6, 6], [2], [2, 3]], [[3, 16], [7, 16]]), ([[-2], [6, 6], [2], [1, 1]], [[1, 10], [1, 5]]), ([[0], [6, 6], [1], [0, -1]], [[1, 36], [-1, 6]]), ([[-1], [6, 6], [1], [5, 1]], [[29, 37], [11, 37]])], [([[2], [6, 6], [-1], [-5, 3]], [[-27, 38], [14, 19]]), ([[0], [6, 6], [-1], [4, 3]], [[3, 4], [1, 2]]), ([[-1], [6, 6], [2], [-3, -5]], [[-4, 19], [-33, 38]]), ([[-2, -2, -1, -2, -2], [6, 6, 6, 6, 6, 6], [0, 0, 1, -2, -1], [3, -2, 5, -3, -2, -4]], [[1, 2], [-1, 6], [487, 557], [-968, 1671], [-376, 557], [-1490, 1671]]), ([[2], [6, 6], [0], [0, 4]], [[0, 1], [2, 3]]), ([[-2], [6, 6], [0], [3, -4]], [[1, 2], [-1, 2]]), ([[0], [6, 6], [0], [1, -2]], [[1, 6], [-1, 3]]), ([[-2], [6, 6], [1], [5, 2]], [[14, 19], [11, 19]])], [([[1], [6, 6], [-1], [-5, -5]], [[-35, 37], [-25, 37]]), ([[-1], [6, 6], [-1], [1, 2]], [[8, 35], [13, 35]]), ([[-1], [6, 6], [2], [-3, -5]], [[-4, 19], [-33, 38]]), ([[-2, -2, -1, -2, -2], [6, 6, 6, 6, 6, 6], [0, 0, 1, -2, -1], [3, -2, 5, -3, -2, -4]], [[1, 2], [-1, 6], [487, 557], [-968, 1671], [-376, 557], [-1490, 1671]]), ([[0, -1], [6, 6, 6], [2, 1], [5, -2, 4]], [[217, 222], [-16, 37], [22, 37]]), ([[-1, -1], [6, 6, 6], [0, -1], [0, -3, -1]], [[0, 1], [-19, 35], [-9, 35]]), ([[-2, 0], [6, 6, 6], [0, -1], [-3, -5, 3]], [[-1, 2], [-11, 12], [1, 2]]), ([[1, 0], [6, 6, 6], [-1, 0], [-3, -3, 5]], [[-21, 37], [-15, 37], [5, 6]])], [([[1], [6, 6], [2], [-1, 4]], [[-7, 17], [25, 34]]), ([[0], [6, 6], [-1], [4, 3]], [[3, 4], [1, 2]]), ([[-1], [6, 6], [2], [-3, -5]], [[-4, 19], [-33, 38]]), ([[-2, -2, -1, -2, -2], [6, 6, 6, 6, 6, 6], [0, 0, 1, -2, -1], [3, -2, 5, -3, -2, -4]], [[1, 2], [-1, 6], [487, 557], [-968, 1671], [-376, 557], [-1490, 1671]]), ([[-1, 2], [6, 6, 6], [-2, 1], [5, 3, -4]], [[107, 96], [27, 32], [-91, 96]]), ([[-2, 2], [6, 6, 6], [-2, 2], [2, -2, 0]], [[5, 21], [-2, 7], [2, 21]]), ([[-2, 1], [6, 6, 6], [0, 2], [4, 4, 2]], [[2, 3], [14, 17], [10, 51]]), ([[1, -1], [6, 6, 6], [-2, 0], [-5, -4, 0]], [[-1, 1], [-1, 2], [-1, 12]])]]
for i, (args, expected) in enumerate(fixtures[N-1]):
    check("explicit oracle %d" % i, solve(args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)

Boundary fixture	Actual	Expected	Outcome
explicit oracle 0	`[[-4, 19], [-33, 38]]`	`[[-4, 19], [-33, 38]]`	Passed
explicit oracle 1	`[[1, 2], [-1, 6], [487, 557], [-968, 1671], [-376, 557], [-1490, 1671]]`	`[[1, 2], [-1, 6], [487, 557], [-968, 1671], [-376, 557], [-1490, 1671]]`	Passed
explicit oracle 2	`[[1, 4], [1, 4]]`	`[[1, 4], [1, 4]]`	Passed
explicit oracle 3	`[[-27, 38], [14, 19]]`	`[[-27, 38], [14, 19]]`	Passed
explicit oracle 4	`[[-35, 37], [-25, 37]]`	`[[-35, 37], [-25, 37]]`	Passed
explicit oracle 5	`[[-1, 3], [13, 18]]`	`[[-1, 3], [13, 18]]`	Passed
explicit oracle 6	`[[-7, 17], [25, 34]]`	`[[-7, 17], [25, 34]]`	Passed
explicit oracle 7	`[[29, 35], [34, 35]]`	`[[29, 35], [34, 35]]`	Passed

SHA-256 / e8b74fa0d6e970fa4eea2dbd92e8f58770cae585180bf89ad8a7b7aca67055d9

Verification & scope

A deterministic bounded teaching model. Inputs are restricted to the explicit contract; this is not a production algebra library. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.

Observations recorded using Python 3.12.14 at 2026-09-29T14:39:26.667753+00:00.

Case digest / 48f310d1cd9c231c10dcffc3b5416e702a00800a5dbc0e5be5723d72fc1a33ad