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Question 12353: Record Original Pairs Whose Reverse Is Missing

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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R0023-12353 · q-20261013-advance-20261026-r07-equivalence-relation-0028

Original question and givens

Use the full fixed carrier Fin(6)={0,…,5} and complete distinct ordered relation pairs=[[0, 0], [1, 1], [2, 2], [3, 3], [4, 4], [5, 5], [0, 1], [0, 2], [2, 0]]. Check reflexivity, symmetry and transitivity separately on the whole carrier. Equivalence classes may be emitted only after all three qualifications pass; one counterexample refutes its corresponding axiom. Give (n,lexicographically ordered original [a,b] pairs for which [b,a] is missing,symmetric?). The records are the original pairs, not their absent reverses.

  • G001 — Use the full fixed carrier Fin(6)={0,…,5} and complete distinct ordered relation pairs=[[0, 0], [1, 1], [2, 2], [3, 3], [4, 4], [5, 5], [0, 1], [0, 2], [2, 0]]. Check reflexivity, symmetry and transitivity separately on the whole carrier. Equivalence classes may be emitted only after all three qualifications pass; one counterexample refutes its corresponding axiom. Give (n,lexicographically ordered original [a,b] pairs for which [b,a] is missing,symmetric?). The records are the original pairs, not their absent reverses.

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

raw relation pairs=[[0, 0], [1, 1], [2, 2], [3, 3], [4, 4], [5, 5], [0, 1], [0, 2], [2, 0]];carrier Fin(6)

After

lexicographically sorted distinct ordered pairs=[[0, 0], [0, 1], [0, 2], [1, 1], [2, 0], [2, 2], [3, 3], [4, 4], [5, 5]]

Conditions: none

List distinct directed pairs lexicographically.Duplicates are invalid;do not silently add reverses,diagonals or a transitive closure.

Step identifiers and dependencies

Rule: complete_relation_no_duplicate_or_implicit_repair · Uses: G001

S002 · implies

Before

original pair=[0, 0];required reverse=[0, 0]

After

reverse present=Yes

Conditions: none

Check for the reverse,but record the original[a,b] on failure,not its missing[b,a] reverse.An empty relation is vacuously symmetric.

Step identifiers and dependencies

Rule: relation_original_pair_missing_reverse_record · Uses: G001, S001

S003 · implies

Before

original pair=[0, 1];required reverse=[1, 0]

After

reverse present=No

Conditions: none

Check for the reverse,but record the original[a,b] on failure,not its missing[b,a] reverse.An empty relation is vacuously symmetric.

Step identifiers and dependencies

Rule: relation_original_pair_missing_reverse_record · Uses: G001, S002

S004 · implies

Before

original pair=[0, 2];required reverse=[2, 0]

After

reverse present=Yes

Conditions: none

Check for the reverse,but record the original[a,b] on failure,not its missing[b,a] reverse.An empty relation is vacuously symmetric.

Step identifiers and dependencies

Rule: relation_original_pair_missing_reverse_record · Uses: G001, S003

S005 · implies

Before

original pair=[1, 1];required reverse=[1, 1]

After

reverse present=Yes

Conditions: none

Check for the reverse,but record the original[a,b] on failure,not its missing[b,a] reverse.An empty relation is vacuously symmetric.

Step identifiers and dependencies

Rule: relation_original_pair_missing_reverse_record · Uses: G001, S004

S006 · implies

Before

original pair=[2, 0];required reverse=[0, 2]

After

reverse present=Yes

Conditions: none

Check for the reverse,but record the original[a,b] on failure,not its missing[b,a] reverse.An empty relation is vacuously symmetric.

Step identifiers and dependencies

Rule: relation_original_pair_missing_reverse_record · Uses: G001, S005

S007 · implies

Before

original pair=[2, 2];required reverse=[2, 2]

After

reverse present=Yes

Conditions: none

Check for the reverse,but record the original[a,b] on failure,not its missing[b,a] reverse.An empty relation is vacuously symmetric.

Step identifiers and dependencies

Rule: relation_original_pair_missing_reverse_record · Uses: G001, S006

S008 · implies

Before

original pair=[3, 3];required reverse=[3, 3]

After

reverse present=Yes

Conditions: none

Check for the reverse,but record the original[a,b] on failure,not its missing[b,a] reverse.An empty relation is vacuously symmetric.

Step identifiers and dependencies

Rule: relation_original_pair_missing_reverse_record · Uses: G001, S007

S009 · implies

Before

original pair=[4, 4];required reverse=[4, 4]

After

reverse present=Yes

Conditions: none

Check for the reverse,but record the original[a,b] on failure,not its missing[b,a] reverse.An empty relation is vacuously symmetric.

Step identifiers and dependencies

Rule: relation_original_pair_missing_reverse_record · Uses: G001, S008

S010 · implies

Before

original pair=[5, 5];required reverse=[5, 5]

After

reverse present=Yes

Conditions: none

Check for the reverse,but record the original[a,b] on failure,not its missing[b,a] reverse.An empty relation is vacuously symmetric.

Step identifiers and dependencies

Rule: relation_original_pair_missing_reverse_record · Uses: G001, S009

Reverse checks

  • S010 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S009 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • 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 — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S006 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S005 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S004 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S003 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S002 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S001 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.

Result

(6, [[0, 1]], No)

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: 0dac2923bdad962d1bb4c066ca4b2a88d8a37d1c3299879f4a468836a104ad35
  • candidate record SHA-256: 512053a0374bb6219b85b99152c90ed6a18b4d87021f0d48ae5294ec7d95c3cf
  • semantic review receipt SHA-256: f783e81f44ff0faa13dbf948657e9187244a59a809ebdf96f22cca24966649ff
  • question-first witness SHA-256: 49a50ed0550be55124d6562260c2ccf4fa6d3f316d7ad9d0d32174400e362e18
  • Lean: NOT_RUN · human review: NOT_PERFORMED
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