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Question 15112: Field Division Uses a Nonzero Denominator and the Same Table

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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R0029-15112 · q-20261014-advance-20261030-r01-finite-field-0062

Original question and givens

Use the same already qualified complete finite commutative unital-ring tables on Fin(5)={0,…,4}, addition=[[0, 1, 2, 3, 4], [1, 3, 0, 4, 2], [2, 0, 4, 1, 3], [3, 4, 1, 2, 0], [4, 2, 3, 0, 1]] and multiplication=[[0, 0, 0, 0, 0], [0, 2, 1, 4, 3], [0, 1, 2, 3, 4], [0, 4, 3, 1, 2], [0, 3, 4, 2, 1]] in carrier-label order. The actual zero and one are distinct and need not be labels 0 and 1. The inverse audit is additional to, not a replacement for, those ring axioms. Division by zero is never defined. A finite field has prime-power order, not necessarily prime order. Under field qualification, numerator=4, denominator=1 is nonzero. Give (numerator,denominator,inverse,quotient,check,pass?).

  • G001 — Use the same already qualified complete finite commutative unital-ring tables on Fin(5)={0,…,4}, addition=[[0, 1, 2, 3, 4], [1, 3, 0, 4, 2], [2, 0, 4, 1, 3], [3, 4, 1, 2, 0], [4, 2, 3, 0, 1]] and multiplication=[[0, 0, 0, 0, 0], [0, 2, 1, 4, 3], [0, 1, 2, 3, 4], [0, 4, 3, 1, 2], [0, 3, 4, 2, 1]] in carrier-label order. The actual zero and one are distinct and need not be labels 0 and 1. The inverse audit is additional to, not a replacement for, those ring axioms. Division by zero is never defined. A finite field has prime-power order, not necessarily prime order. Under field qualification, numerator=4, denominator=1 is nonzero. Give (numerator,denominator,inverse,quotient,check,pass?).

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

same complete carrier Fin(5);addition=[[0, 1, 2, 3, 4], [1, 3, 0, 4, 2], [2, 0, 4, 1, 3], [3, 4, 1, 2, 0], [4, 2, 3, 0, 1]];multiplication=[[0, 0, 0, 0, 0], [0, 2, 1, 4, 3], [0, 1, 2, 3, 4], [0, 4, 3, 1, 2], [0, 3, 4, 2, 1]]

After

actual zero=0;one=2;additive inverses=[0, 2, 1, 4, 3];additive commute/associate=[Yes, Yes];multiplicative commute/associate=[Yes, Yes];left/right distributive=[Yes, Yes]

Conditions: none

Even where the raw inverse oracle has looser guards,independently qualify the complete commutative unital parent declared by the source English scope,including every additive/distributive axiom and distinct identities.Do not skip them by name or inverse search alone.

Step identifiers and dependencies

Rule: field_stated_full_commutative_parent_not_raw_oracle_shortcut · Uses: G001

S002 · implies

Before

element label=0;actual zero=0;one=2;two-sided multiplicative inverse candidates=[]

After

selected inverse witness=null;nonzero inverse obligation=No

Conditions: none

Search the whole carrier for both products equaling the actual one.Nonzero is judged against the actual zero,not label0;zero has no inverse obligation.

Step identifiers and dependencies

Rule: field_all_nonzero_inverse_obligations_actual_labels · Uses: G001, S001

S003 · implies

Before

element label=1;actual zero=0;one=2;two-sided multiplicative inverse candidates=[1]

After

selected inverse witness=1;nonzero inverse obligation=Yes

Conditions: none

Search the whole carrier for both products equaling the actual one.Nonzero is judged against the actual zero,not label0;zero has no inverse obligation.

Step identifiers and dependencies

Rule: field_all_nonzero_inverse_obligations_actual_labels · Uses: G001, S002

S004 · implies

Before

element label=2;actual zero=0;one=2;two-sided multiplicative inverse candidates=[2]

After

selected inverse witness=2;nonzero inverse obligation=Yes

Conditions: none

Search the whole carrier for both products equaling the actual one.Nonzero is judged against the actual zero,not label0;zero has no inverse obligation.

Step identifiers and dependencies

Rule: field_all_nonzero_inverse_obligations_actual_labels · Uses: G001, S003

S005 · implies

Before

element label=3;actual zero=0;one=2;two-sided multiplicative inverse candidates=[4]

After

selected inverse witness=4;nonzero inverse obligation=Yes

Conditions: none

Search the whole carrier for both products equaling the actual one.Nonzero is judged against the actual zero,not label0;zero has no inverse obligation.

Step identifiers and dependencies

Rule: field_all_nonzero_inverse_obligations_actual_labels · Uses: G001, S004

S006 · implies

Before

element label=4;actual zero=0;one=2;two-sided multiplicative inverse candidates=[3]

After

selected inverse witness=3;nonzero inverse obligation=Yes

Conditions: none

Search the whole carrier for both products equaling the actual one.Nonzero is judged against the actual zero,not label0;zero has no inverse obligation.

Step identifiers and dependencies

Rule: field_all_nonzero_inverse_obligations_actual_labels · Uses: G001, S005

S007 · implies

Before

qualified field;raw numerator label=4;nonzero denominator label=1;inverse=1;multiplication row=[0, 3, 4, 2, 1]

After

quotient label=3;quotient*denominator=4=numerator

Conditions: none

Use the same multiplication table for numerator times denominator inverse,then multiply back by the nonzero denominator.The numerator may be actual zero.No integer division of labels or division by zero is defined.

Step identifiers and dependencies

Rule: field_division_same_table_multiply_back · Uses: G001, S006

Reverse checks

  • 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

(4, 1, 1, 3, 4, Yes)

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: a5fde92e125a480463b1aa092611742d5e99a258398161e5acd39d61f515c62e
  • candidate record SHA-256: 133d89fe1e35c410bd70771486c1ee90b4c3b552eb54a81859c21bd2564f3300
  • semantic review receipt SHA-256: 8c0ef6ca8c5ba2754e41f30c2b32bcb757756152d97421f7396d39038c11f725
  • question-first witness SHA-256: c7920a0ff8e724b7e566ebbda30b31d8087c136974b62f8c760fbd26ab816117
  • Lean: NOT_RUN · human review: NOT_PERFORMED
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