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Question 31994: Relative Complement in an Explicit Universe

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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R0062-31994 · q-20260915-finite-relative-complement-0019

Original question and givens

Let the explicit universe be U={1081, 1082, 1083, 1084, 1085} and A={1081, 1083}⊆U. Find the relative complement U\A, listing each element once in increasing order.

  • G001 — Let the explicit universe be U={1081, 1082, 1083, 1084, 1085} and A={1081, 1083}⊆U. Find the relative complement U\A, listing each element once in increasing order.

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-finite-relative-complement, no-domain-field, no-operation-field, no-form-field]

After

derived = [[numeric_sorted_set_STRING_or_empty_symbol]]

Conditions: none

Check THIS bank interface:BASE equations use form/domain;BASE events/complement have no operation;factorials have no domain.ext18 uses local hyphens,other legacy operations underscores.Do not force every answer into a tuple or fraction.

Step identifiers and dependencies

Rule: R62_EXACT_source_keys_domain_operation_form_AND_output_types · Uses: G001

S002 · implies

Before

source roles = [U ORIGINAL explicit universe, [1081, 1082, 1083, 1084, 1085]]

After

derived = [[1081, 1082, 1083, 1084, 1085]]

Conditions: none

The BASE finite set is a DISTINCT integer list;do not silently repair duplicates.Sort numerically ONLY for derived display,retaining original data.Do not import the expectation100-element or SAFE bounds.

Step identifiers and dependencies

Rule: BASE_FINITE_set_distinct_INTEGER_list_no_silent_duplicate_fix · Uses: G001, S001

S003 · implies

Before

source roles = [A ORIGINAL subset, [1081, 1083]]

After

derived = [[1081, 1083]]

Conditions: none

The BASE finite set is a DISTINCT integer list;do not silently repair duplicates.Sort numerically ONLY for derived display,retaining original data.Do not import the expectation100-element or SAFE bounds.

Step identifiers and dependencies

Rule: BASE_FINITE_set_distinct_INTEGER_list_no_silent_duplicate_fix · Uses: G001, S002

S004 · implies

Before

source roles = [0, 1081, [1081, 1083]]

After

derived = [No]

Conditions: none

For EACH ORIGINAL label of the EXPLICIT universe U,retain it ONLY when not in A.This is U\A,not A\U or complement in an unstated universe.

Step identifiers and dependencies

Rule: Complement_EACH_ORIGINAL_universe_label_NOT_in_A · Uses: G001, S003

S005 · implies

Before

source roles = [1, 1082, [1081, 1083]]

After

derived = [Yes]

Conditions: none

For EACH ORIGINAL label of the EXPLICIT universe U,retain it ONLY when not in A.This is U\A,not A\U or complement in an unstated universe.

Step identifiers and dependencies

Rule: Complement_EACH_ORIGINAL_universe_label_NOT_in_A · Uses: G001, S004

S006 · implies

Before

source roles = [2, 1083, [1081, 1083]]

After

derived = [No]

Conditions: none

For EACH ORIGINAL label of the EXPLICIT universe U,retain it ONLY when not in A.This is U\A,not A\U or complement in an unstated universe.

Step identifiers and dependencies

Rule: Complement_EACH_ORIGINAL_universe_label_NOT_in_A · Uses: G001, S005

S007 · implies

Before

source roles = [3, 1084, [1081, 1083]]

After

derived = [Yes]

Conditions: none

For EACH ORIGINAL label of the EXPLICIT universe U,retain it ONLY when not in A.This is U\A,not A\U or complement in an unstated universe.

Step identifiers and dependencies

Rule: Complement_EACH_ORIGINAL_universe_label_NOT_in_A · Uses: G001, S006

S008 · implies

Before

source roles = [4, 1085, [1081, 1083]]

After

derived = [Yes]

Conditions: none

For EACH ORIGINAL label of the EXPLICIT universe U,retain it ONLY when not in A.This is U\A,not A\U or complement in an unstated universe.

Step identifiers and dependencies

Rule: Complement_EACH_ORIGINAL_universe_label_NOT_in_A · Uses: G001, S007

S009 · implies

Before

source roles = [[1081, 1082, 1083, 1084, 1085], [1081, 1083]]

After

derived = [[1082, 1084, 1085], {1082, 1084, 1085}, Yes]

Conditions: none

AFTER A⊆U qualification,verify disjointness and union BACK to U,without lost/added labels.Display numeric increasing order once per element,or∅for empty.Keep ORIGINAL U/A order and data unchanged.

Step identifiers and dependencies

Rule: Complement_COMPLETE_disjoint_partition_of_fixed_U_numeric_set_display · Uses: G001, S008

Reverse checks

  • S009 · premise_and_result_audit — Reverse-check the ORIGINAL inputs,field roles,domain and premises.Consistency does not imply unique recovery of premises.Keep finite checking,independent review,formal proof and publication separate.
  • S008 · premise_and_result_audit — Reverse-check the ORIGINAL inputs,field roles,domain and premises.Consistency does not imply unique recovery of premises.Keep finite checking,independent review,formal proof and publication separate.
  • S007 · premise_and_result_audit — Reverse-check the ORIGINAL inputs,field roles,domain and premises.Consistency does not imply unique recovery of premises.Keep finite checking,independent review,formal proof and publication separate.
  • S006 · premise_and_result_audit — Reverse-check the ORIGINAL inputs,field roles,domain and premises.Consistency does not imply unique recovery of premises.Keep finite checking,independent review,formal proof and publication separate.
  • S005 · premise_and_result_audit — Reverse-check the ORIGINAL inputs,field roles,domain and premises.Consistency does not imply unique recovery of premises.Keep finite checking,independent review,formal proof and publication separate.
  • S004 · premise_and_result_audit — Reverse-check the ORIGINAL inputs,field roles,domain and premises.Consistency does not imply unique recovery of premises.Keep finite checking,independent review,formal proof and publication separate.
  • S003 · premise_and_result_audit — Reverse-check the ORIGINAL inputs,field roles,domain and premises.Consistency does not imply unique recovery of premises.Keep finite checking,independent review,formal proof and publication separate.
  • S002 · premise_and_result_audit — Reverse-check the ORIGINAL inputs,field roles,domain and premises.Consistency does not imply unique recovery of premises.Keep finite checking,independent review,formal proof and publication separate.
  • S001 · premise_and_result_audit — Reverse-check the ORIGINAL inputs,field roles,domain and premises.Consistency does not imply unique recovery of premises.Keep finite checking,independent review,formal proof and publication separate.

Result

{1082, 1084, 1085}

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: 1e10424052e9e62cc7e1e4c26d5524cb14085a2fe1f5878b062ca907ec242b49
  • candidate record SHA-256: b9d401b4b3018ac667f9a47bdfc239bf0432e8f88e0e3c315daa92e4566c9352
  • semantic review receipt SHA-256: 963099ffc9f754069fdce6792949a85ed350472465eaceb3038fa8011cf672bd
  • question-first witness SHA-256: d7655324c5d11528e1af90b757384cebd3313e19dc5f6f5b9b8ea7624fb06f6f
  • Lean: NOT_RUN · human review: NOT_PERFORMED
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