Question 11706: A Whole-Edge Dirichlet Coefficient Identity

Original question and givens

Use the quadratic candidate coefficients=[-7, -2, 2, 2, 1, -2] in fixed order [1,x,y,x²,x*y,y²]. Rectangle bounds [x_min,x_max,y_min,y_max]=[-7, 7, -6, 8]. Left/right fix x, leaving y; bottom/top fix y, leaving x. Boundary polynomials use ascending coefficients [constant,linear,quadratic]. Compare every coefficient for an edge identity, not a few sampled boundary values. Selected edge=right; supplied coefficients=[78, 9, -2]. Give (bounds,edge,remaining variable,restriction coefficients,supplied coefficients,coefficientwise identity?,declared_edge_only). Interior PDE and boundary data are separate obligations. Symbolic success covers only this candidate and declared BVP, not a general existence, uniqueness, stability, regularity or well-posedness theorem.

• G001 — Use the quadratic candidate coefficients=[-7, -2, 2, 2, 1, -2] in fixed order [1,x,y,x²,x*y,y²]. Rectangle bounds [x_min,x_max,y_min,y_max]=[-7, 7, -6, 8]. Left/right fix x, leaving y; bottom/top fix y, leaving x. Boundary polynomials use ascending coefficients [constant,linear,quadratic]. Compare every coefficient for an edge identity, not a few sampled boundary values. Selected edge=right; supplied coefficients=[78, 9, -2]. Give (bounds,edge,remaining variable,restriction coefficients,supplied coefficients,coefficientwise identity?,declared_edge_only). Interior PDE and boundary data are separate obligations. Symbolic success covers only this candidate and declared BVP, not a general existence, uniqueness, stability, regularity or well-posedness theorem.

Definition and scope

Use the original question domain, assumptions and cited MKO definitions. This item has second-context mathematical and bilingual review, with the model, answer and every arithmetic step independently recomputed from the original parameters; the source question remains a candidate.

• mko-boundary-value-problem

Step-by-step derivation

original coefficients=[-7, -2, 2, 2, 1, -2];basis=[1,x,y,x^2,xy,y^2]

u(x,y)=(-7)+(-2)*x+(2)*y+(2)*x^2+(1)*x*y+(-2)*y^2

selected boundary fixed coordinate squared := mul(7, 7)

selected boundary fixed coordinate squared = 49

selected boundary fixed linear term := mul(-2, 7)

selected boundary fixed linear term = -14

selected boundary fixed square term := mul(2, 49)

selected boundary fixed square term = 98

selected boundary constant coefficient := sum(-7, -14, 98)

selected boundary constant coefficient = 77

selected boundary cross contribution := mul(1, 7)

selected boundary cross contribution = 7

selected boundary linear coefficient := sum(2, 7)

selected boundary linear coefficient = 9

selected boundary:vary y;fix x=7;original coefficients=[-7, -2, 2, 2, 1, -2]

ascending y slice coefficients=[77, 9, -2]

selected boundary coefficient residual0 := sub(77, 78)

selected boundary coefficient residual0 = -1

selected boundary coefficient residual1 := sub(9, 9)

selected boundary coefficient residual1 = 0

selected boundary coefficient residual2 := sub(-2, -2)

selected boundary coefficient residual2 = 0

selected boundary:edge=right;bounds=[-7, 7, -6, 8];remaining variable=y;restriction=[77, 9, -2];supplied=[78, 9, -2]

all coefficient residuals=[-1, 0, 0];polynomial identity=No

Reverse checks

• S012 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• S011 · premise_and_result_audit — Recompute selected boundary coefficient residual2 with exact rational arithmetic, not rounded decimals.
• S010 · premise_and_result_audit — Recompute selected boundary coefficient residual1 with exact rational arithmetic, not rounded decimals.
• S009 · premise_and_result_audit — Recompute selected boundary coefficient residual0 with exact rational arithmetic, not rounded decimals.
• S008 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• S007 · premise_and_result_audit — Recompute selected boundary linear coefficient with exact rational arithmetic, not rounded decimals.
• S006 · premise_and_result_audit — Recompute selected boundary cross contribution with exact rational arithmetic, not rounded decimals.
• S005 · premise_and_result_audit — Recompute selected boundary constant coefficient with exact rational arithmetic, not rounded decimals.
• S004 · premise_and_result_audit — Recompute selected boundary fixed square term with exact rational arithmetic, not rounded decimals.
• S003 · premise_and_result_audit — Recompute selected boundary fixed linear term with exact rational arithmetic, not rounded decimals.
• S002 · premise_and_result_audit — Recompute selected boundary fixed coordinate squared with exact rational arithmetic, not rounded decimals.
• S001 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.

Result

([-7, 7, -6, 8], right, y, [77, 9, -2], [78, 9, -2], No, declared_edge_only)

The full substitutions and premise checks give the original answer; source identity,format and status are unchanged.

This question review and source binding

Review date: 2026-10-26

Original questions, answers, step expressions, numeric ASTs and historical records are retained. Source candidate labels remain historical and are not overwritten as formal proof.