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R0027-14121 · q-20261014-advance-20261029-r04-conditional-expectation-0071
Use one complete finite probability space with outcome indices 0 through 3, aligned masses=[12/49, 30/49, 2/49, 5/49], values X=[8, 3, 22, -8], and conditioning-block labels=[0, 1, 1, 2]. Masses are nonnegative and total exactly 1. Block labels describe a partition of this same space; list block summaries in increasing label order and outcomes in original index order. Conditional expectation is constant on each positive-mass block, with its weighted mean, and preserves every block integral. A zero-mass block is only determined almost surely: return a.s._arbitrary, never divide by zero. Use exact reduced fractions with positive denominators, omitting /1 for integers. Selected block_label=0 must exist. Give (block_label,indices,original_integral,conditional_integral,equal?,boundary). Boundary is positive_block or null_block_a.s._arbitrary.
G001 — Use one complete finite probability space with outcome indices 0 through 3, aligned masses=[12/49, 30/49, 2/49, 5/49], values X=[8, 3, 22, -8], and conditioning-block labels=[0, 1, 1, 2]. Masses are nonnegative and total exactly 1. Block labels describe a partition of this same space; list block summaries in increasing label order and outcomes in original index order. Conditional expectation is constant on each positive-mass block, with its weighted mean, and preserves every block integral. A zero-mass block is only determined almost surely: return a.s._arbitrary, never divide by zero. Use exact reduced fractions with positive denominators, omitting /1 for integers. Selected block_label=0 must exist. Give (block_label,indices,original_integral,conditional_integral,equal?,boundary). Boundary is positive_block or null_block_a.s._arbitrary.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.
Before
conditional model whole mass sum := sum(12/49, 30/49, 2/49, 5/49)
After
conditional model whole mass sum = 1
Conditions: none
Compute exactly from original roles,complete pairings and established intermediates,retaining denominators,signs and zeros.
Rule: exact_rational_arithmetic · Uses: G001
Before
conditional model:raw aligned masses=[[12, 49], [30, 49], [2, 49], [5, 49]]
After
normalized masses=[12/49, 30/49, 2/49, 5/49];nonnegative=Yes;total=1
Conditions: none
First qualify nonnegativity and exact unit total on one complete finite probability model.Retain zero-mass atoms;do not assume uniformity or substitute another model.
Rule: whole_finite_probability_law_not_uniform_assumption · Uses: G001, S001
Before
same outcome indices=[0, 1, 2, 3];X values=[8, 3, 22, -8];block labels=[0, 1, 1, 2]
After
distinct conditioning labels in increasing order=[0, 1, 2]
Conditions: none
Each label fiber is a conditioning block.Labels need not be consecutive.Sort summaries by label but retain original outcome indices within blocks;labels are not array positions.
Rule: conditional_partition_same_space_original_indices · Uses: G001, S002
Before
block0 mass := sum(12/49)
After
block0 mass = 12/49
Conditions: none
Compute exactly from original roles,complete pairings and established intermediates,retaining denominators,signs and zeros.
Rule: exact_rational_arithmetic · Uses: G001, S003
Before
block0 atom0 weighted X := mul(12/49, 8)
After
block0 atom0 weighted X = 96/49
Conditions: none
Compute exactly from original roles,complete pairings and established intermediates,retaining denominators,signs and zeros.
Rule: exact_rational_arithmetic · Uses: G001, S004
Before
block0 original weighted integral := sum(96/49)
After
block0 original weighted integral = 96/49
Conditions: none
Compute exactly from original roles,complete pairings and established intermediates,retaining denominators,signs and zeros.
Rule: exact_rational_arithmetic · Uses: G001, S005
Before
block0 positive-mass conditional mean := div(96/49, 12/49)
After
block0 positive-mass conditional mean = 8
Conditions: none
Compute exactly from original roles,complete pairings and established intermediates,retaining denominators,signs and zeros.
Rule: exact_rational_arithmetic · Uses: G001, S006
Before
block label=0;indices=[0];positive mass=12/49;weighted integral=96/49
After
block-constant conditional value=8
Conditions: none
Divide the weighted integral by mass only when mass is positive.A zero mean remains the determined numeric value0,not a null-block marker.Copy the same value to every atom in the block.
Rule: positive_block_mean_including_zero_mean · Uses: G001, S007
Before
block1 mass := sum(30/49, 2/49)
After
block1 mass = 32/49
Conditions: none
Compute exactly from original roles,complete pairings and established intermediates,retaining denominators,signs and zeros.
Rule: exact_rational_arithmetic · Uses: G001, S008
Before
block1 atom1 weighted X := mul(30/49, 3)
After
block1 atom1 weighted X = 90/49
Conditions: none
Compute exactly from original roles,complete pairings and established intermediates,retaining denominators,signs and zeros.
Rule: exact_rational_arithmetic · Uses: G001, S009
Before
block1 atom2 weighted X := mul(2/49, 22)
After
block1 atom2 weighted X = 44/49
Conditions: none
Compute exactly from original roles,complete pairings and established intermediates,retaining denominators,signs and zeros.
Rule: exact_rational_arithmetic · Uses: G001, S010
Before
block1 original weighted integral := sum(90/49, 44/49)
After
block1 original weighted integral = 134/49
Conditions: none
Compute exactly from original roles,complete pairings and established intermediates,retaining denominators,signs and zeros.
Rule: exact_rational_arithmetic · Uses: G001, S011
Before
block1 positive-mass conditional mean := div(134/49, 32/49)
After
block1 positive-mass conditional mean = 67/16
Conditions: none
Compute exactly from original roles,complete pairings and established intermediates,retaining denominators,signs and zeros.
Rule: exact_rational_arithmetic · Uses: G001, S012
Before
block label=1;indices=[1, 2];positive mass=32/49;weighted integral=134/49
After
block-constant conditional value=67/16
Conditions: none
Divide the weighted integral by mass only when mass is positive.A zero mean remains the determined numeric value0,not a null-block marker.Copy the same value to every atom in the block.
Rule: positive_block_mean_including_zero_mean · Uses: G001, S013
Before
block2 mass := sum(5/49)
After
block2 mass = 5/49
Conditions: none
Compute exactly from original roles,complete pairings and established intermediates,retaining denominators,signs and zeros.
Rule: exact_rational_arithmetic · Uses: G001, S014
Before
block2 atom3 weighted X := mul(5/49, -8)
After
block2 atom3 weighted X = -40/49
Conditions: none
Compute exactly from original roles,complete pairings and established intermediates,retaining denominators,signs and zeros.
Rule: exact_rational_arithmetic · Uses: G001, S015
Before
block2 original weighted integral := sum(-40/49)
After
block2 original weighted integral = -40/49
Conditions: none
Compute exactly from original roles,complete pairings and established intermediates,retaining denominators,signs and zeros.
Rule: exact_rational_arithmetic · Uses: G001, S016
Before
block2 positive-mass conditional mean := div(-40/49, 5/49)
After
block2 positive-mass conditional mean = -8
Conditions: none
Compute exactly from original roles,complete pairings and established intermediates,retaining denominators,signs and zeros.
Rule: exact_rational_arithmetic · Uses: G001, S017
Before
block label=2;indices=[3];positive mass=5/49;weighted integral=-40/49
After
block-constant conditional value=-8
Conditions: none
Divide the weighted integral by mass only when mass is positive.A zero mean remains the determined numeric value0,not a null-block marker.Copy the same value to every atom in the block.
Rule: positive_block_mean_including_zero_mean · Uses: G001, S018
Before
selected block block0 conditional integral := mul(12/49, 8)
After
selected block block0 conditional integral = 96/49
Conditions: none
Compute exactly from original roles,complete pairings and established intermediates,retaining denominators,signs and zeros.
Rule: exact_rational_arithmetic · Uses: G001, S019
Before
selected block=0;indices=[0];original integral=96/49;conditional integral=96/49
After
equal=Yes;this is the selected block obligation,not only a global average
Conditions: none
On a positive block,mass*(weighted/mass)=weighted;on a null block both sides are0.The definition requires blockwise integral identities;total expectation equality alone cannot replace them.
Rule: conditional_selected_block_integral_identity · Uses: G001, S020
S021 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.S020 · premise_and_result_audit — Recompute selected block block0 conditional integral with exact rational arithmetic, not rounded decimals.S019 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.S018 · premise_and_result_audit — Recompute block2 positive-mass conditional mean with exact rational arithmetic, not rounded decimals.S017 · premise_and_result_audit — Recompute block2 original weighted integral with exact rational arithmetic, not rounded decimals.S016 · premise_and_result_audit — Recompute block2 atom3 weighted X with exact rational arithmetic, not rounded decimals.S015 · premise_and_result_audit — Recompute block2 mass with exact rational arithmetic, not rounded decimals.S014 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.S013 · premise_and_result_audit — Recompute block1 positive-mass conditional mean with exact rational arithmetic, not rounded decimals.S012 · premise_and_result_audit — Recompute block1 original weighted integral with exact rational arithmetic, not rounded decimals.S011 · premise_and_result_audit — Recompute block1 atom2 weighted X with exact rational arithmetic, not rounded decimals.S010 · premise_and_result_audit — Recompute block1 atom1 weighted X with exact rational arithmetic, not rounded decimals.S009 · premise_and_result_audit — Recompute block1 mass with exact rational arithmetic, not rounded decimals.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 — Recompute block0 positive-mass conditional mean with exact rational arithmetic, not rounded decimals.S006 · premise_and_result_audit — Recompute block0 original weighted integral with exact rational arithmetic, not rounded decimals.S005 · premise_and_result_audit — Recompute block0 atom0 weighted X with exact rational arithmetic, not rounded decimals.S004 · premise_and_result_audit — Recompute block0 mass with exact rational arithmetic, not rounded decimals.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 — Recompute conditional model whole mass sum with exact rational arithmetic, not rounded decimals.(0, [0], 96/49, 96/49, Yes, positive_block)
The full substitutions and premise checks give the original answer; source identity,format and status are unchanged.
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.
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