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Question 35334: Least Permitted Preimage of a Target

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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R0069-35334 · q-20261004-advance-20261005-r02-surjective-0059

Original question and givens

The declared total function f:A→B has A={-2, -1, 0}, B={-4, -3, -2, -1}, and table {(-2, -1), (-1, -1), (0, -2)}. For t=-4∈B, find its numerically least permitted preimage, answering none when there is no preimage.

  • G001 — The declared total function f:A→B has A={-2, -1, 0}, B={-4, -3, -2, -1}, and table {(-2, -1), (-1, -1), (0, -2)}. For t=-4∈B, find its numerically least permitted preimage, answering none when there is no preimage.

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-surjective-first-preimage, [A, B, operation, pairs, t]]

After

derived = [first_preimage, no-invented-domain]

Conditions: none

Keep EACH bank’s keys/operation/domain distinct:LDL/PULSE/function legacy table underscores,TREE full tree_* with its declared domain,and permissive BASE signed without invented op/domain.All arithmetic respects the binary-primitive contract.

Step identifiers and dependencies

Rule: R69_SOURCE_specific_keys_operation_domain_AND_binary_contract · Uses: G001

S002 · implies

Before

source roles = [function ORIGINAL A, 100, [-2, -1, 0]]

After

derived = [[-2, -1, 0]]

Conditions: none

Type EVERY RAW SAFE label,distinctness and THIS bank’s cardinality bound;empty is allowed.Sort ONLY the derived representation,not original JSON.Do not exchange TREE and LDL limits.

Step identifiers and dependencies

Rule: Finite_RAW_ALL_SAFE_distinct_labels_then_derived_sort · Uses: G001, S001

S003 · implies

Before

source roles = [function ORIGINAL B, 100, [-4, -3, -2, -1]]

After

derived = [[-4, -3, -2, -1]]

Conditions: none

Type EVERY RAW SAFE label,distinctness and THIS bank’s cardinality bound;empty is allowed.Sort ONLY the derived representation,not original JSON.Do not exchange TREE and LDL limits.

Step identifiers and dependencies

Rule: Finite_RAW_ALL_SAFE_distinct_labels_then_derived_sort · Uses: G001, S002

S004 · implies

Before

source roles = [function ORIGINAL table, 0, [-2, -1]]

After

derived = [[-2, -1]]

Conditions: none

BEFORE deduplication,type EACH RAW pair as EXACTLY TWO SAFE components.Identical rows may be representation duplicates,but no unvalidated cell may be silently discarded.

Step identifiers and dependencies

Rule: Pairs_EVERY_RAW_two_SAFE_cells_BEFORE_any_dedup · Uses: G001, S003

S005 · implies

Before

source roles = [function ORIGINAL table, 1, [-1, -1]]

After

derived = [[-1, -1]]

Conditions: none

BEFORE deduplication,type EACH RAW pair as EXACTLY TWO SAFE components.Identical rows may be representation duplicates,but no unvalidated cell may be silently discarded.

Step identifiers and dependencies

Rule: Pairs_EVERY_RAW_two_SAFE_cells_BEFORE_any_dedup · Uses: G001, S004

S006 · implies

Before

source roles = [function ORIGINAL table, 2, [0, -2]]

After

derived = [[0, -2]]

Conditions: none

BEFORE deduplication,type EACH RAW pair as EXACTLY TWO SAFE components.Identical rows may be representation duplicates,but no unvalidated cell may be silently discarded.

Step identifiers and dependencies

Rule: Pairs_EVERY_RAW_two_SAFE_cells_BEFORE_any_dedup · Uses: G001, S005

S007 · implies

Before

source roles = [[-2, -1, 0], [-4, -3, -2, -1], [[-2, -1], [-1, -1], [0, -2]]]

After

derived = [Yes]

Conditions: none

FIRST qualify the WHOLE total function A→B:EXACTLY one output for EVERY A and all pairs in A×B.Identical repeated rows normalize in THIS legacy bank,unlike a different PULSE table rule.Qualify ORIGINAL B even for later codomain changes.

Step identifiers and dependencies

Rule: Function_WHOLE_qualified_total_AtoB_before_SURJECTIVE_claim · Uses: G001, S006

S008 · implies

Before

source roles = [ORIGINAL B, -2, -1, -4]

After

derived = [No]

Conditions: none

Compare EVERY permitted input’s output with THIS target.List EACH fiber completely;do not confuse target/input or infer surjectivity from cardinalities alone.

Step identifiers and dependencies

Rule: Surjective_EVERY_source_target_fiber_comparison · Uses: G001, S007

S009 · implies

Before

source roles = [ORIGINAL B, -1, -1, -4]

After

derived = [No]

Conditions: none

Compare EVERY permitted input’s output with THIS target.List EACH fiber completely;do not confuse target/input or infer surjectivity from cardinalities alone.

Step identifiers and dependencies

Rule: Surjective_EVERY_source_target_fiber_comparison · Uses: G001, S008

S010 · implies

Before

source roles = [ORIGINAL B, 0, -2, -4]

After

derived = [No]

Conditions: none

Compare EVERY permitted input’s output with THIS target.List EACH fiber completely;do not confuse target/input or infer surjectivity from cardinalities alone.

Step identifiers and dependencies

Rule: Surjective_EVERY_source_target_fiber_comparison · Uses: G001, S009

S011 · implies

Before

source roles = [ORIGINAL B, -2, -1, -3]

After

derived = [No]

Conditions: none

Compare EVERY permitted input’s output with THIS target.List EACH fiber completely;do not confuse target/input or infer surjectivity from cardinalities alone.

Step identifiers and dependencies

Rule: Surjective_EVERY_source_target_fiber_comparison · Uses: G001, S010

S012 · implies

Before

source roles = [ORIGINAL B, -1, -1, -3]

After

derived = [No]

Conditions: none

Compare EVERY permitted input’s output with THIS target.List EACH fiber completely;do not confuse target/input or infer surjectivity from cardinalities alone.

Step identifiers and dependencies

Rule: Surjective_EVERY_source_target_fiber_comparison · Uses: G001, S011

S013 · implies

Before

source roles = [ORIGINAL B, 0, -2, -3]

After

derived = [No]

Conditions: none

Compare EVERY permitted input’s output with THIS target.List EACH fiber completely;do not confuse target/input or infer surjectivity from cardinalities alone.

Step identifiers and dependencies

Rule: Surjective_EVERY_source_target_fiber_comparison · Uses: G001, S012

S014 · implies

Before

source roles = [ORIGINAL B, -2, -1, -2]

After

derived = [No]

Conditions: none

Compare EVERY permitted input’s output with THIS target.List EACH fiber completely;do not confuse target/input or infer surjectivity from cardinalities alone.

Step identifiers and dependencies

Rule: Surjective_EVERY_source_target_fiber_comparison · Uses: G001, S013

S015 · implies

Before

source roles = [ORIGINAL B, -1, -1, -2]

After

derived = [No]

Conditions: none

Compare EVERY permitted input’s output with THIS target.List EACH fiber completely;do not confuse target/input or infer surjectivity from cardinalities alone.

Step identifiers and dependencies

Rule: Surjective_EVERY_source_target_fiber_comparison · Uses: G001, S014

S016 · implies

Before

source roles = [ORIGINAL B, 0, -2, -2]

After

derived = [Yes]

Conditions: none

Compare EVERY permitted input’s output with THIS target.List EACH fiber completely;do not confuse target/input or infer surjectivity from cardinalities alone.

Step identifiers and dependencies

Rule: Surjective_EVERY_source_target_fiber_comparison · Uses: G001, S015

S017 · implies

Before

source roles = [ORIGINAL B, -2, -1, -1]

After

derived = [Yes]

Conditions: none

Compare EVERY permitted input’s output with THIS target.List EACH fiber completely;do not confuse target/input or infer surjectivity from cardinalities alone.

Step identifiers and dependencies

Rule: Surjective_EVERY_source_target_fiber_comparison · Uses: G001, S016

S018 · implies

Before

source roles = [ORIGINAL B, -1, -1, -1]

After

derived = [Yes]

Conditions: none

Compare EVERY permitted input’s output with THIS target.List EACH fiber completely;do not confuse target/input or infer surjectivity from cardinalities alone.

Step identifiers and dependencies

Rule: Surjective_EVERY_source_target_fiber_comparison · Uses: G001, S017

S019 · implies

Before

source roles = [ORIGINAL B, 0, -2, -1]

After

derived = [No]

Conditions: none

Compare EVERY permitted input’s output with THIS target.List EACH fiber completely;do not confuse target/input or infer surjectivity from cardinalities alone.

Step identifiers and dependencies

Rule: Surjective_EVERY_source_target_fiber_comparison · Uses: G001, S018

S020 · implies

Before

source roles = [-4, [[-4, []], [-3, []], [-2, [0]], [-1, [-2, -1]]]]

After

derived = [[], does not exist]

Conditions: none

FIRST require t∈declared B.Then choose the NUMERICALLY LEAST input in its COMPLETE fiber,not the first raw-list position.Empty fiber gives none;existence does not imply uniqueness.

Step identifiers and dependencies

Rule: Surjective_FIRST_preimage_NUMERIC_least_or_none_NOT_unique · Uses: G001, S019

Reverse checks

  • S020 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S019 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S018 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S017 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S016 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S015 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S014 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S013 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S012 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S011 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S010 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S009 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S008 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S007 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S006 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S005 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S004 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S003 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S002 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S001 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.

Result

none

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: 8a5dfd8c6b4742bb8bc7fae00e6296a530b39d09d15b695439001fa3490340fa
  • candidate record SHA-256: 8dc3ab878c9e045364ff3383334e2c6e9a5f82a1aaba24486c4dc6c2f648043f
  • semantic review receipt SHA-256: ccf93c72638d6abf6a412514da5838d55ecb09b71d0e4fdec2b559dc9fdee14b
  • question-first witness SHA-256: 11af9a338b5a610342b2cfb2ee295683131b3139ac402dd19b1ba1725976d518
  • Lean: NOT_RUN · human review: NOT_PERFORMED
Same-source full JSON