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Question 27084: An Affine Error on the Whole Unit Interval Has an Exact Attained Supremum

On this page
  1. Original question and givens
  2. Definition and scope
  3. Step-by-step derivation
  4. Reverse checks
  5. Result
  6. This question review and source binding

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R0053-27084 · q-20261015-advance-20261117-r03-uniform-limit-continuity-theorem-0009

Original question and givens

On [0,1] let f(x)=m*x+b and f_n(x)=f(x)+E*x/(n+1), with exact m=-2,b=9,E=9>0,n=9≥1. Give (base_slope, base_intercept, error_scale, n, function_description, sup_error, attainment_statement, uniform_certificate).

  • G001 — On [0,1] let f(x)=m*x+b and f_n(x)=f(x)+E*x/(n+1), with exact m=-2,b=9,E=9>0,n=9≥1. Give (base_slope, base_intercept, error_scale, n, function_description, sup_error, attainment_statement, uniform_certificate).

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.

Step-by-step derivation

S001 · implies

Before

source roles = [uniform-sup-certificate]

After

derived = [[base_slope, base_intercept, error_scale, n, function_description, sup_error, attainment_statement, uniform_certificate]]

Conditions: none

List the complete source field order and mode-specific roles without JavaScript or answer-shape inference;No,undefined and infinity retain their distinct meanings.

Step identifiers and dependencies

Rule: source_ordered_fields_without_JS · Uses: G001

S002 · calculation

Before

Uniform ORIGINAL error over n plus one := div(9, 10)

After

Uniform ORIGINAL error over n plus one = 9/10

Conditions: none

Substitute original roles and established intermediates exactly;no approximation,slot substitution or internally consistent changed operand.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S001

S003 · implies

Before

source roles = [-2, 9, 9, 9]

After

derived = [f(x)=base_slope*x+base_intercept, f_n(x)-f(x)=(9)*x/10, 9/10, EVERY x in[0,1]:0<=x<=1;attain at x=1, Yes]

Conditions: none

The given affine law covers the WHOLE[0,1],not sampled points.Subtraction cancels the same base.With E>0,the absolute error is E*x/(n+1)<=E/(n+1) for every x,and x=1 attains it.Hence this is the exact supremum;the affine terms and limit are continuous.

Step identifiers and dependencies

Rule: Uniform_WHOLE_affine_difference_absolute_bound_and_attainment · Uses: G001, S002

Reverse checks

  • S003 · premise_and_result_audit — Reverse-check the complete original data,step operands and premises;finite checks,conditional named-theorem use and general formal proof remain distinct.
  • S002 · premise_and_result_audit — Recompute Uniform ORIGINAL error over n plus one with exact rational arithmetic, not rounded decimals.
  • S001 · premise_and_result_audit — Reverse-check the complete original data,step operands and premises;finite checks,conditional named-theorem use and general formal proof remain distinct.

Result

(-2, 9, 9, 9, f_n(x)=-2x+9+9x/10, 9/10, sup_on_[0,1]_attained_at_x=1, Yes)

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.

Source hashes and review receipts
  • input commit: 0f7be61e2c22317a4075561dc822c87d881a50db
  • original question SHA-256: df87c98437577514957c9e78019a02ff9921c0d73e46aed82bb817116b95e2db
  • candidate record SHA-256: ad988f6bf849b15b83d549ee12571e6871599cdfc9ecc2692313845a652d5a18
  • semantic review receipt SHA-256: 1b7a62514347b82518305d5feb4369a52d7d44c442a0f2b131e9eb3cd7b45f62
  • question-first witness SHA-256: 79dc2a1077081f3ea2a03f75e32778163bf05e814cdf4c29ed86e567295f9ee1
  • Lean: NOT_RUN · human review: NOT_PERFORMED
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