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Question 32251: Affine Limit on a Punctured Real Domain

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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R0063-32251 · q-20261007-advance-20261008-r02-function-limit-0001

Original question and givens

On R∖{0}, f(x)=(0)x+(0). Find its punctured two-sided limit as x→0, without assigning f(0).

  • G001 — On R∖{0}, f(x)=(0)x+(0). Find its punctured two-sided limit as x→0, without assigning f(0).

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 = [qf-function-limit-affine, affine_punctured_limit, punctured_reals, []]

After

derived = [[integer_approach_value_STRING_OMIT1]]

Conditions: none

BASE sources do not acquire a generic legacy operation/domain or unknown-metadata ban.Retain metadata WITHOUT using it as an answer oracle.PULSE/legacy enforce their exact source keys,operation/domain.Do not impose universal tuples,/1 or input bounds.

Step identifiers and dependencies

Rule: R63_SOURCE_bank_keys_operation_domain_output_roles_metadata_not_oracle · Uses: G001

S002 · calculation

Before

Punctured affine ORIGINAL slope times approach center := mul(0, 0)

After

Punctured affine ORIGINAL slope times approach center = 0

Conditions: none

Use ORIGINAL operands and order for exact integer/rational arithmetic.Raw bounds are bank-specific;derived values do not inherit SAFE or foreign small caps.No floating approximation.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S001

S003 · calculation

Before

Punctured affine ORIGINAL approach affine constant sum := sum(0, 0)

After

Punctured affine ORIGINAL approach affine constant sum = 0

Conditions: none

Use ORIGINAL operands and order for exact integer/rational arithmetic.Raw bounds are bank-specific;derived values do not inherit SAFE or foreign small caps.No floating approximation.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S002

S004 · calculation

Before

Punctured affine ORIGINAL positive slope bound one plus abs m := sum(1, 0)

After

Punctured affine ORIGINAL positive slope bound one plus abs m = 1

Conditions: none

Use ORIGINAL operands and order for exact integer/rational arithmetic.Raw bounds are bank-specific;derived values do not inherit SAFE or foreign small caps.No floating approximation.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S003

S005 · implies

Before

source roles = [Punctured affine, 0, 0, 0]

After

derived = [0, 1, error = m*(x-a), delta = epsilon/1]

Conditions: none

For the WHOLE GIVEN affine law,f(x)−L=m(x−a).For ANY ε>0 choose δ=ε/(1+|m|)>0;on the declared side/punctured domain,0<|x−a|<δ gives error<ε.At m0 the error is0.This is an APPROACH value,not assignment of original f(a)or a sample-based proof.

Step identifiers and dependencies

Rule: Limit_AFFINE_whole_law_error_epsilon_delta_NOT_center_assignment · Uses: G001, S004

Reverse checks

  • S005 · premise_and_result_audit — Reverse-check ORIGINAL inputs,types,domain and premises;the conclusion need not uniquely recover its premises.Keep source-bound candidates,independent review,formal proof and publication separate.
  • S004 · premise_and_result_audit — Recompute Punctured affine ORIGINAL positive slope bound one plus abs m with exact rational arithmetic, not rounded decimals.
  • S003 · premise_and_result_audit — Recompute Punctured affine ORIGINAL approach affine constant sum with exact rational arithmetic, not rounded decimals.
  • S002 · premise_and_result_audit — Recompute Punctured affine ORIGINAL slope times approach center with exact rational arithmetic, not rounded decimals.
  • S001 · premise_and_result_audit — Reverse-check ORIGINAL inputs,types,domain and premises;the conclusion need not uniquely recover its premises.Keep source-bound candidates,independent review,formal proof and publication separate.

Result

0

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: cdbedc6035d66a6cec85077a4999bba8f1ea80e29268fb687c2294d9b657bb6d
  • candidate record SHA-256: 12b9543b292c09e9c6eac9306c742b2b0fe0e18be7914ae05f24f0f4ab5d7e27
  • semantic review receipt SHA-256: acf03b776f4855e3869810bcbecf1116e3a2b11dfb1e2a5dfbcf8135ad24a7d0
  • question-first witness SHA-256: eadbbac3220988b52754f32450fb536d627217306d1ce28a49134f56c21bfa88
  • Lean: NOT_RUN · human review: NOT_PERFORMED
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