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Question 32526: Integer Membership

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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← Question derivation index · Original question batch

R0064-32526 · q-20260919-integer-membership-0001

Original question and givens

Does 0.5 belong to the integer set Z?

  • G001 — Does 0.5 belong to the integer set Z?

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-integer-membership, no-required-operation, no-required-domain, []]

After

derived = [[mathematical_membership_YesNo_STRING]]

Conditions: none

Legacy banks enforce their exact source keys/operation/domain.BASE integers retain metadata without treating it as an oracle.Distinguish NUMBER,string,fraction pair and vector equality formats;retain original bilingual data/AST/status.

Step identifiers and dependencies

Rule: R64_SOURCE_exact_legacy_interface_BASE_metadata_AND_output_roles · Uses: G001

S002 · implies

Before

source roles = [0.5, No]

After

derived = [No, 1/2, No]

Conditions: none

FIRST verify the raw string and Boolean flag against the declared ASCII syntax,THEN classify the exact value.The frozen No cases are genuine half-integers.A parser rejecting string1.0 does NOT prove real1.0 is outside Z.Ambiguous out-of-slice cases are not false mathematical No answers.

Step identifiers and dependencies

Rule: Integer_RAW_ASCII_syntax_flag_verified_SEPARATE_exact_numeric_value · Uses: G001, S001

S003 · calculation

Before

Integer nonmember ORIGINAL floor times reduced denominator := mul(0, 2)

After

Integer nonmember ORIGINAL floor times reduced denominator = 0

Conditions: none

Use ORIGINAL operands/order for exact integer/rational arithmetic.RAW bounds are bank-specific;derived values are not SAFE-recapped or approximated.Do not import legacy caps into BASE integers.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S002

S004 · calculation

Before

Integer nonmember ORIGINAL numerator minus floor product := sub(1, 0)

After

Integer nonmember ORIGINAL numerator minus floor product = 1

Conditions: none

Use ORIGINAL operands/order for exact integer/rational arithmetic.RAW bounds are bank-specific;derived values are not SAFE-recapped or approximated.Do not import legacy caps into BASE integers.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S003

S005 · calculation

Before

Integer nonmember ORIGINAL positive proper remainder fraction := div(1, 2)

After

Integer nonmember ORIGINAL positive proper remainder fraction = 1/2

Conditions: none

Use ORIGINAL operands/order for exact integer/rational arithmetic.RAW bounds are bank-specific;derived values are not SAFE-recapped or approximated.Do not import legacy caps into BASE integers.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S004

S006 · calculation

Before

Integer nonmember ORIGINAL value minus lower integer := sub(1/2, 0)

After

Integer nonmember ORIGINAL value minus lower integer = 1/2

Conditions: none

Use ORIGINAL operands/order for exact integer/rational arithmetic.RAW bounds are bank-specific;derived values are not SAFE-recapped or approximated.Do not import legacy caps into BASE integers.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S005

S007 · calculation

Before

Integer nonmember ORIGINAL upper integer minus value := sub(1, 1/2)

After

Integer nonmember ORIGINAL upper integer minus value = 1/2

Conditions: none

Use ORIGINAL operands/order for exact integer/rational arithmetic.RAW bounds are bank-specific;derived values are not SAFE-recapped or approximated.Do not import legacy caps into BASE integers.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S006

S008 · implies

Before

source roles = [0.5, 1/2, 0, 2]

After

derived = [0, 1, 1/2, 1/2, 1/2, k < value < k+1]

Conditions: none

Reduce to n/d and write n=kd+r with0<r<d.The value lies STRICTLY between consecutive integers k,k+1,so cannot be an integer.These five have denominator2 and odd numerators;this does NOT classify every decimal representation as noninteger.

Step identifiers and dependencies

Rule: Integer_NONmember_EXACT_between_consecutive_integers_NOT_all_decimals · Uses: G001, S007

Reverse checks

  • S008 · premise_and_result_audit — Reverse-check ORIGINAL data,field roles,types,domain and premises;the conclusion need not uniquely recover its premises.Keep source-bound candidates,independent review,formal proof and publication separate.
  • S007 · premise_and_result_audit — Recompute Integer nonmember ORIGINAL upper integer minus value with exact rational arithmetic, not rounded decimals.
  • S006 · premise_and_result_audit — Recompute Integer nonmember ORIGINAL value minus lower integer with exact rational arithmetic, not rounded decimals.
  • S005 · premise_and_result_audit — Recompute Integer nonmember ORIGINAL positive proper remainder fraction with exact rational arithmetic, not rounded decimals.
  • S004 · premise_and_result_audit — Recompute Integer nonmember ORIGINAL numerator minus floor product with exact rational arithmetic, not rounded decimals.
  • S003 · premise_and_result_audit — Recompute Integer nonmember ORIGINAL floor times reduced denominator with exact rational arithmetic, not rounded decimals.
  • S002 · premise_and_result_audit — Reverse-check ORIGINAL data,field roles,types,domain and premises;the conclusion need not uniquely recover its premises.Keep source-bound candidates,independent review,formal proof and publication separate.
  • S001 · premise_and_result_audit — Reverse-check ORIGINAL data,field roles,types,domain and premises;the conclusion need not uniquely recover its premises.Keep source-bound candidates,independent review,formal proof and publication separate.

Result

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: 00cba39cfe92034dd68ba0195e163554ae4517fdbf32c6bc3984f1b2e11662ad
  • candidate record SHA-256: cea9d1d251daa0edb36d92a18e0125cbc98e46a7a4165a5a4d0d6d659e2e3377
  • semantic review receipt SHA-256: 8b9ea3ddfab468e9e3f0a0fc0f7682987d5e030be0d7c8860fd85df19cbe183b
  • question-first witness SHA-256: 066bfeab8fc279706861faade71b9a18a61a25235fc48700092f0488d2a6da6a
  • Lean: NOT_RUN · human review: NOT_PERFORMED
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