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Question 27476: Sum Valuation Is at Least the Minimum, with Equality Guaranteed Only at Unequal Valuations

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

R0053-27476 · q-20261015-advance-20261118-r05-p-adic-valuation-integers-0051

Original question and givens

Use prime p=2, nonzero summands a=2, b=4; their sum may be zero. Give (p, a, b, valuation_a, valuation_b, sum, valuation_sum, minimum_valuation, ultrametric_inequality, valuations_unequal, equality_when_unequal_or_not_guaranteed).

  • G001 — Use prime p=2, nonzero summands a=2, b=4; their sum may be zero. Give (p, a, b, valuation_a, valuation_b, sum, valuation_sum, minimum_valuation, ultrametric_inequality, valuations_unequal, equality_when_unequal_or_not_guaranteed).

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 = [pval-sum-ultrametric]

After

derived = [[p, a, b, valuation_a, valuation_b, sum, valuation_sum, minimum_valuation, ultrametric_inequality, valuations_unequal, equality_when_unequal_or_not_guaranteed]]

Conditions: none

List the complete source field order and mode-specific roles without JavaScript or answer-shape inference;No,undefined and infinity retain their distinct meanings.

Step identifiers and dependencies

Rule: source_ordered_fields_without_JS · Uses: G001

S002 · calculation

Before

Valuation ORIGINAL a ORIGINAL division step1 := div(2, 2)

After

Valuation ORIGINAL a ORIGINAL division step1 = 1

Conditions: none

Substitute original roles and established intermediates exactly;no approximation,slot substitution or internally consistent changed operand.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S001

S003 · calculation

Before

Valuation ORIGINAL a dividing prime power1 := mul(1, 2)

After

Valuation ORIGINAL a dividing prime power1 = 2

Conditions: none

Substitute original roles and established intermediates exactly;no approximation,slot substitution or internally consistent changed operand.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S002

S004 · implies

Before

source roles = [Valuation ORIGINAL a, 2, 2, 2, 1]

After

derived = [1, 2, 0, Yes]

Conditions: none

Divide only when the current unit is divisible by p.Each step preserves |a|=p^k*unit and strictly decreases the positive unit,so it terminates.Derived integers do not inherit the raw-input1e6 cap.

Step identifiers and dependencies

Rule: Valuation_EACH_division_source_remainder_and_factor_invariant · Uses: G001, S003

S005 · calculation

Before

Valuation ORIGINAL a terminal factorization product := mul(2, 1)

After

Valuation ORIGINAL a terminal factorization product = 2

Conditions: none

Substitute original roles and established intermediates exactly;no approximation,slot substitution or internally consistent changed operand.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S004

S006 · implies

Before

source roles = [Valuation ORIGINAL a, 2, 2, 2, 1, 1, [2]]

After

derived = [2, 1, Yes, Yes]

Conditions: none

At termination p does not divide the unit,so p^(k+1) does not divide |a| and k is maximal.A sign does not affect divisibility;the factorization is for |a|,not negative a equalling a positive product.

Step identifiers and dependencies

Rule: Valuation_terminal_NONdivisible_unit_highest_power · Uses: G001, S005

S007 · calculation

Before

Valuation ORIGINAL b ORIGINAL division step1 := div(4, 2)

After

Valuation ORIGINAL b ORIGINAL division step1 = 2

Conditions: none

Substitute original roles and established intermediates exactly;no approximation,slot substitution or internally consistent changed operand.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S006

S008 · calculation

Before

Valuation ORIGINAL b dividing prime power1 := mul(1, 2)

After

Valuation ORIGINAL b dividing prime power1 = 2

Conditions: none

Substitute original roles and established intermediates exactly;no approximation,slot substitution or internally consistent changed operand.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S007

S009 · implies

Before

source roles = [Valuation ORIGINAL b, 2, 4, 4, 1]

After

derived = [2, 2, 0, Yes]

Conditions: none

Divide only when the current unit is divisible by p.Each step preserves |a|=p^k*unit and strictly decreases the positive unit,so it terminates.Derived integers do not inherit the raw-input1e6 cap.

Step identifiers and dependencies

Rule: Valuation_EACH_division_source_remainder_and_factor_invariant · Uses: G001, S008

S010 · calculation

Before

Valuation ORIGINAL b ORIGINAL division step2 := div(2, 2)

After

Valuation ORIGINAL b ORIGINAL division step2 = 1

Conditions: none

Substitute original roles and established intermediates exactly;no approximation,slot substitution or internally consistent changed operand.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S009

S011 · calculation

Before

Valuation ORIGINAL b dividing prime power2 := mul(2, 2)

After

Valuation ORIGINAL b dividing prime power2 = 4

Conditions: none

Substitute original roles and established intermediates exactly;no approximation,slot substitution or internally consistent changed operand.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S010

S012 · implies

Before

source roles = [Valuation ORIGINAL b, 2, 4, 2, 2]

After

derived = [1, 4, 0, Yes]

Conditions: none

Divide only when the current unit is divisible by p.Each step preserves |a|=p^k*unit and strictly decreases the positive unit,so it terminates.Derived integers do not inherit the raw-input1e6 cap.

Step identifiers and dependencies

Rule: Valuation_EACH_division_source_remainder_and_factor_invariant · Uses: G001, S011

S013 · calculation

Before

Valuation ORIGINAL b terminal factorization product := mul(4, 1)

After

Valuation ORIGINAL b terminal factorization product = 4

Conditions: none

Substitute original roles and established intermediates exactly;no approximation,slot substitution or internally consistent changed operand.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S012

S014 · implies

Before

source roles = [Valuation ORIGINAL b, 2, 4, 4, 2, 1, [2, 4]]

After

derived = [4, 1, Yes, Yes]

Conditions: none

At termination p does not divide the unit,so p^(k+1) does not divide |a| and k is maximal.A sign does not affect divisibility;the factorization is for |a|,not negative a equalling a positive product.

Step identifiers and dependencies

Rule: Valuation_terminal_NONdivisible_unit_highest_power · Uses: G001, S013

S015 · calculation

Before

Valuation ORIGINAL a plus b := sum(2, 4)

After

Valuation ORIGINAL a plus b = 6

Conditions: none

Substitute original roles and established intermediates exactly;no approximation,slot substitution or internally consistent changed operand.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S014

S016 · calculation

Before

Valuation ACTUAL sum ORIGINAL division step1 := div(6, 2)

After

Valuation ACTUAL sum ORIGINAL division step1 = 3

Conditions: none

Substitute original roles and established intermediates exactly;no approximation,slot substitution or internally consistent changed operand.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S015

S017 · calculation

Before

Valuation ACTUAL sum dividing prime power1 := mul(1, 2)

After

Valuation ACTUAL sum dividing prime power1 = 2

Conditions: none

Substitute original roles and established intermediates exactly;no approximation,slot substitution or internally consistent changed operand.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S016

S018 · implies

Before

source roles = [Valuation ACTUAL sum, 2, 6, 6, 1]

After

derived = [3, 2, 0, Yes]

Conditions: none

Divide only when the current unit is divisible by p.Each step preserves |a|=p^k*unit and strictly decreases the positive unit,so it terminates.Derived integers do not inherit the raw-input1e6 cap.

Step identifiers and dependencies

Rule: Valuation_EACH_division_source_remainder_and_factor_invariant · Uses: G001, S017

S019 · calculation

Before

Valuation ACTUAL sum terminal factorization product := mul(2, 3)

After

Valuation ACTUAL sum terminal factorization product = 6

Conditions: none

Substitute original roles and established intermediates exactly;no approximation,slot substitution or internally consistent changed operand.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S018

S020 · implies

Before

source roles = [Valuation ACTUAL sum, 2, 6, 6, 1, 3, [2]]

After

derived = [6, 1, Yes, Yes]

Conditions: none

At termination p does not divide the unit,so p^(k+1) does not divide |a| and k is maximal.A sign does not affect divisibility;the factorization is for |a|,not negative a equalling a positive product.

Step identifiers and dependencies

Rule: Valuation_terminal_NONdivisible_unit_highest_power · Uses: G001, S019

S021 · implies

Before

source roles = [2, 2, 4, 1, 2, 1]

After

derived = [6, 1, Yes, Yes, Yes]

Conditions: none

Factor the common p^min from the sum,so its valuation is at least min.If r<s,the bracket u+p^(s-r)v is congruent to nonzero u mod p,hence has exact exponent r;the symmetric case is analogous.When r=s,cancellation may raise the exponent or equality may remain.The last field is not_guaranteed,not a claim that this instance fails equality.

Step identifiers and dependencies

Rule: Valuation_GENERAL_common_power_ultrametric_AND_unequal_case · Uses: G001, S020

Reverse checks

  • S021 · premise_and_result_audit — Reverse-check the complete original data,step operands and premises;finite checks,conditional named-theorem use and general formal proof remain distinct.
  • S020 · premise_and_result_audit — Reverse-check the complete original data,step operands and premises;finite checks,conditional named-theorem use and general formal proof remain distinct.
  • S019 · premise_and_result_audit — Recompute Valuation ACTUAL sum terminal factorization product with exact rational arithmetic, not rounded decimals.
  • S018 · premise_and_result_audit — Reverse-check the complete original data,step operands and premises;finite checks,conditional named-theorem use and general formal proof remain distinct.
  • S017 · premise_and_result_audit — Recompute Valuation ACTUAL sum dividing prime power1 with exact rational arithmetic, not rounded decimals.
  • S016 · premise_and_result_audit — Recompute Valuation ACTUAL sum ORIGINAL division step1 with exact rational arithmetic, not rounded decimals.
  • S015 · premise_and_result_audit — Recompute Valuation ORIGINAL a plus b with exact rational arithmetic, not rounded decimals.
  • S014 · premise_and_result_audit — Reverse-check the complete original data,step operands and premises;finite checks,conditional named-theorem use and general formal proof remain distinct.
  • S013 · premise_and_result_audit — Recompute Valuation ORIGINAL b terminal factorization product with exact rational arithmetic, not rounded decimals.
  • S012 · premise_and_result_audit — Reverse-check the complete original data,step operands and premises;finite checks,conditional named-theorem use and general formal proof remain distinct.
  • S011 · premise_and_result_audit — Recompute Valuation ORIGINAL b dividing prime power2 with exact rational arithmetic, not rounded decimals.
  • S010 · premise_and_result_audit — Recompute Valuation ORIGINAL b ORIGINAL division step2 with exact rational arithmetic, not rounded decimals.
  • S009 · premise_and_result_audit — Reverse-check the complete original data,step operands and premises;finite checks,conditional named-theorem use and general formal proof remain distinct.
  • S008 · premise_and_result_audit — Recompute Valuation ORIGINAL b dividing prime power1 with exact rational arithmetic, not rounded decimals.
  • S007 · premise_and_result_audit — Recompute Valuation ORIGINAL b ORIGINAL division step1 with exact rational arithmetic, not rounded decimals.
  • S006 · premise_and_result_audit — Reverse-check the complete original data,step operands and premises;finite checks,conditional named-theorem use and general formal proof remain distinct.
  • S005 · premise_and_result_audit — Recompute Valuation ORIGINAL a terminal factorization product with exact rational arithmetic, not rounded decimals.
  • S004 · premise_and_result_audit — Reverse-check the complete original data,step operands and premises;finite checks,conditional named-theorem use and general formal proof remain distinct.
  • S003 · premise_and_result_audit — Recompute Valuation ORIGINAL a dividing prime power1 with exact rational arithmetic, not rounded decimals.
  • S002 · premise_and_result_audit — Recompute Valuation ORIGINAL a ORIGINAL division step1 with exact rational arithmetic, not rounded decimals.
  • S001 · premise_and_result_audit — Reverse-check the complete original data,step operands and premises;finite checks,conditional named-theorem use and general formal proof remain distinct.

Result

(2, 2, 4, 1, 2, 6, 1, 1, Yes, Yes, 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: 340787ffd6b7df944e504071cfdd638fe0493dda15ec5d63a5dc31b2b737fc34
  • candidate record SHA-256: f88f738246da2d8d552cd444a57c614b01836a2bb68e31cf20d07de13642d7cd
  • semantic review receipt SHA-256: 1b7a62514347b82518305d5feb4369a52d7d44c442a0f2b131e9eb3cd7b45f62
  • question-first witness SHA-256: 79dc2a1077081f3ea2a03f75e32778163bf05e814cdf4c29ed86e567295f9ee1
  • Lean: NOT_RUN · human review: NOT_PERFORMED
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