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Question 20260: Keep the Source Pointwise Check Distinct from Almost-Sure Nonnegativity

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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R0039-20260 · q-20261014-advance-20261107-r04-markov-inequality-0010

Original question and givens

Use complete normalized finite law with exact masses=[1/15, 2/15, 12/15] and aligned total values X=[0, 10, 12]. Each mass is nonnegative and the masses sum to1. All moments here are finite. The prototype checks every value for its pointwise nonnegativity flag; a null-mass negative value is not by itself failure of the theorem's almost-sure premise. Give (masses, values, all_values_nonnegative, expectation, source_Markov_qualification, certificate).

  • G001 — Use complete normalized finite law with exact masses=[1/15, 2/15, 12/15] and aligned total values X=[0, 10, 12]. Each mass is nonnegative and the masses sum to1. All moments here are finite. The prototype checks every value for its pointwise nonnegativity flag; a null-mass negative value is not by itself failure of the theorem's almost-sure premise. Give (masses, values, all_values_nonnegative, expectation, source_Markov_qualification, certificate).

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 operation=markov-qualification;original snapshot and mathematics retained

After

explicit ordered source output fields=[masses, values, all_values_nonnegative, expectation, source_Markov_qualification, certificate]

Conditions: none

Retain the historical interface marker in the original snapshot while listing ordered source fields here,without JavaScript or external lookup.Field labels are not additional mathematical evidence,and No retains the source claim scope.

Step identifiers and dependencies

Rule: source_ordered_interface_explicit_without_javascript · Uses: G001

S002 · calculation

Before

Markov complete probability mass := sum(1/15, 2/15, 4/5)

After

Markov complete probability mass = 1

Conditions: none

Substitute original roles and established intermediates exactly,retaining indices,signs,denominators and the proof's applicability conditions.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S001

S003 · calculation

Before

Markov original atom0 weighted X := mul(1/15, 0)

After

Markov original atom0 weighted X = 0

Conditions: none

Substitute original roles and established intermediates exactly,retaining indices,signs,denominators and the proof's applicability conditions.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S002

S004 · calculation

Before

Markov original atom1 weighted X := mul(2/15, 10)

After

Markov original atom1 weighted X = 4/3

Conditions: none

Substitute original roles and established intermediates exactly,retaining indices,signs,denominators and the proof's applicability conditions.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S003

S005 · calculation

Before

Markov original atom2 weighted X := mul(4/5, 12)

After

Markov original atom2 weighted X = 48/5

Conditions: none

Substitute original roles and established intermediates exactly,retaining indices,signs,denominators and the proof's applicability conditions.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S004

S006 · calculation

Before

Markov complete SAME-law expectation := sum(0, 4/3, 48/5)

After

Markov complete SAME-law expectation = 164/15

Conditions: none

Substitute original roles and established intermediates exactly,retaining indices,signs,denominators and the proof's applicability conditions.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S005

S007 · implies

Before

ORIGINAL complete nonempty masses=[1/15, 2/15, 4/5];ALL aligned values X=[0, 10, 12];full mass=1;ALL weighted X terms=[0, 4/3, 48/5]

After

finite exact expectation=164/15;prototype EVERY-ENTRY nonnegative=Yes;actual positive-mass nonnegativity=Yes;null-negative atoms=[];positive-mass negative atoms=[]

Conditions: none

The prototype flag tests every table entry,whereas almost-sure nonnegativity concerns positive-mass atoms only.The English source-review guard excludes null-only negative ambiguities from non-tail families rather than calling them a theorem-premise failure.The tail itself can still be computed for signed X.

Step identifiers and dependencies

Rule: markov_pointwise_source_gate_not_almost_sure_confusion · Uses: G001, S006

S008 · implies

Before

prototype every-entry nonnegative flag=Yes;actual a.s.nonnegative=Yes;exact finite expectation=164/15

After

SOURCE qualification repeats its pointwise flag=Yes;pointwise nonnegativity is SUFFICIENT,not NECESSARY in general for the theorem's a.s. premise

Conditions: none

Retain both occurrences of the same source prototype flag rather than changing the answer to a different a.s.test.Expectations in this finite model are finite.The tag names the audited condition;false does not certify that it holds,and null-only ambiguities remain guarded.

Step identifiers and dependencies

Rule: markov_source_qualification_repeated_flag_not_general_necessity · Uses: G001, S007

Reverse checks

  • 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 — Recompute Markov complete SAME-law expectation with exact rational arithmetic, not rounded decimals.
  • S005 · premise_and_result_audit — Recompute Markov original atom2 weighted X with exact rational arithmetic, not rounded decimals.
  • S004 · premise_and_result_audit — Recompute Markov original atom1 weighted X with exact rational arithmetic, not rounded decimals.
  • S003 · premise_and_result_audit — Recompute Markov original atom0 weighted X with exact rational arithmetic, not rounded decimals.
  • S002 · premise_and_result_audit — Recompute Markov complete probability mass with exact rational arithmetic, not rounded decimals.
  • S001 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.

Result

([1/15, 2/15, 4/5], [0, 10, 12], Yes, 164/15, Yes, finite_expectation_and_nonnegative_almost_sure)

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: 482b1008006a016df7936315861f8c0b531c9e2ce9fb4510a21dc1d4d86bef18
  • candidate record SHA-256: 8426ab52fa3f2bc121b33c0d1e8b40760d6b5df8dc0b7776f2c71076f3250e0c
  • semantic review receipt SHA-256: 6e11e35fafe32f16900ce9b522d01acb7b2ee6b463ab179392076cfbe1af8034
  • question-first witness SHA-256: cc0fa361fc25151729e70264340d2eae94f179f6f2a2edfe80ba5704fbbd0682
  • Lean: NOT_RUN · human review: NOT_PERFORMED
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