Question 14118: Preserve Every Selected Conditioning-Block Integral

Original question and givens

Use one complete finite probability space with outcome indices 0 through 3, aligned masses=[12/49, 16/49, 9/49, 12/49], values X=[5, 0, 19, -5], and conditioning-block labels=[0, 0, 1, 1]. 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, 16/49, 9/49, 12/49], values X=[5, 0, 19, -5], and conditioning-block labels=[0, 0, 1, 1]. 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.

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.

• mko-conditional-expectation

Step-by-step derivation

conditional model whole mass sum := sum(12/49, 16/49, 9/49, 12/49)

conditional model whole mass sum = 1

conditional model:raw aligned masses=[[12, 49], [16, 49], [9, 49], [12, 49]]

normalized masses=[12/49, 16/49, 9/49, 12/49];nonnegative=Yes;total=1

same outcome indices=[0, 1, 2, 3];X values=[5, 0, 19, -5];block labels=[0, 0, 1, 1]

distinct conditioning labels in increasing order=[0, 1]

block0 mass := sum(12/49, 16/49)

block0 mass = 4/7

block0 atom0 weighted X := mul(12/49, 5)

block0 atom0 weighted X = 60/49

block0 atom1 weighted X := mul(16/49, 0)

block0 atom1 weighted X = 0

block0 original weighted integral := sum(60/49, 0)

block0 original weighted integral = 60/49

block0 positive-mass conditional mean := div(60/49, 4/7)

block0 positive-mass conditional mean = 15/7

block label=0;indices=[0, 1];positive mass=4/7;weighted integral=60/49

block-constant conditional value=15/7

block1 mass := sum(9/49, 12/49)

block1 mass = 3/7

block1 atom2 weighted X := mul(9/49, 19)

block1 atom2 weighted X = 171/49

block1 atom3 weighted X := mul(12/49, -5)

block1 atom3 weighted X = -60/49

block1 original weighted integral := sum(171/49, -60/49)

block1 original weighted integral = 111/49

block1 positive-mass conditional mean := div(111/49, 3/7)

block1 positive-mass conditional mean = 37/7

block label=1;indices=[2, 3];positive mass=3/7;weighted integral=111/49

block-constant conditional value=37/7

selected block block0 conditional integral := mul(4/7, 15/7)

selected block block0 conditional integral = 60/49

selected block=0;indices=[0, 1];original integral=60/49;conditional integral=60/49

equal=Yes;this is the selected block obligation,not only a global average

Reverse checks

• S017 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• S016 · premise_and_result_audit — Recompute selected block block0 conditional integral with exact rational arithmetic, not rounded decimals.
• S015 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• S014 · premise_and_result_audit — Recompute block1 positive-mass conditional mean with exact rational arithmetic, not rounded decimals.
• S013 · premise_and_result_audit — Recompute block1 original weighted integral with exact rational arithmetic, not rounded decimals.
• S012 · premise_and_result_audit — Recompute block1 atom3 weighted X 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 mass with exact rational arithmetic, not rounded decimals.
• S009 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• S008 · premise_and_result_audit — Recompute block0 positive-mass conditional mean with exact rational arithmetic, not rounded decimals.
• S007 · premise_and_result_audit — Recompute block0 original weighted integral with exact rational arithmetic, not rounded decimals.
• S006 · premise_and_result_audit — Recompute block0 atom1 weighted X 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.

Result

(0, [0, 1], 60/49, 60/49, Yes, positive_block)

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.