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Question 31912: Cardinality of a Finite Event

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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R0062-31912 · q-20260918-finite-event-cardinality-0012

Original question and givens

Let S={45, 46, 47}, F=P(S), and E={45, 47}. What is the cardinality of E?

  • G001 — Let S={45, 46, 47}, F=P(S), and E={45, 47}. What is the cardinality of E?

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 = [qf-finite-event-cardinality, no-domain-field, no-operation-field, no-form-field]

After

derived = [[cardinality_NUMBER_not_probability]]

Conditions: none

Check THIS bank interface:BASE equations use form/domain;BASE events/complement have no operation;factorials have no domain.ext18 uses local hyphens,other legacy operations underscores.Do not force every answer into a tuple or fraction.

Step identifiers and dependencies

Rule: R62_EXACT_source_keys_domain_operation_form_AND_output_types · Uses: G001

S002 · implies

Before

source roles = [S original sample, [45, 46, 47]]

After

derived = [[45, 46, 47]]

Conditions: none

The BASE finite set is a DISTINCT integer list;do not silently repair duplicates.Sort numerically ONLY for derived display,retaining original data.Do not import the expectation100-element or SAFE bounds.

Step identifiers and dependencies

Rule: BASE_FINITE_set_distinct_INTEGER_list_no_silent_duplicate_fix · Uses: G001, S001

S003 · implies

Before

source roles = [E original event candidate, [45, 47]]

After

derived = [[45, 47]]

Conditions: none

The BASE finite set is a DISTINCT integer list;do not silently repair duplicates.Sort numerically ONLY for derived display,retaining original data.Do not import the expectation100-element or SAFE bounds.

Step identifiers and dependencies

Rule: BASE_FINITE_set_distinct_INTEGER_list_no_silent_duplicate_fix · Uses: G001, S002

S004 · implies

Before

source roles = [0, 45, [45, 46, 47]]

After

derived = [Yes]

Conditions: none

Check EACH candidate event element in ORIGINAL S.The empty event satisfies the subset condition vacuously.F=P(S)is not a probability law and does not imply equal likelihood.

Step identifiers and dependencies

Rule: Event_EACH_candidate_element_membership_in_ORIGINAL_S · Uses: G001, S003

S005 · implies

Before

source roles = [1, 47, [45, 46, 47]]

After

derived = [Yes]

Conditions: none

Check EACH candidate event element in ORIGINAL S.The empty event satisfies the subset condition vacuously.F=P(S)is not a probability law and does not imply equal likelihood.

Step identifiers and dependencies

Rule: Event_EACH_candidate_element_membership_in_ORIGINAL_S · Uses: G001, S004

S006 · implies

Before

source roles = [[45, 46, 47], [45, 47], P(S)]

After

derived = [[Yes, Yes], [], Yes]

Conditions: none

With EXACT F=P(S),event qualification is precisely E⊆S.An outside E is a LEGAL No in subset-validity;do not delete the witness first.Cardinality,occurrence and probability are distinct questions.

Step identifiers and dependencies

Rule: Event_FULLpowerset_qualification_ALL_subset_flags_NOT_probability · Uses: G001, S005

S007 · calculation

Before

Event cardinality ORIGINAL distinct element slot0 := sum(0, 1)

After

Event cardinality ORIGINAL distinct element slot0 = 1

Conditions: none

Use ORIGINAL operands and declared order for exact integer/rational arithmetic,not floats.Bounds are family-specific:do not revalidate derived values as RAW inputs or add blanket SAFE/n64 caps to BASE families.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S006

S008 · calculation

Before

Event cardinality ORIGINAL distinct element slot1 := sum(1, 1)

After

Event cardinality ORIGINAL distinct element slot1 = 2

Conditions: none

Use ORIGINAL operands and declared order for exact integer/rational arithmetic,not floats.Bounds are family-specific:do not revalidate derived values as RAW inputs or add blanket SAFE/n64 caps to BASE families.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S007

S009 · implies

Before

source roles = [[45, 46, 47], [45, 47]]

After

derived = [2]

Conditions: none

Count EACH distinct element for|E|.The answer is a NUMBER,not a fraction or probability.The empty event has cardinality0,even when S is empty.No uniform distribution is assumed.

Step identifiers and dependencies

Rule: Event_CARDINALITY_NUMBER_distinct_count_NO_probability_or_nonempty_S · Uses: G001, S008

Reverse checks

  • S009 · premise_and_result_audit — Reverse-check the ORIGINAL inputs,field roles,domain and premises.Consistency does not imply unique recovery of premises.Keep finite checking,independent review,formal proof and publication separate.
  • S008 · premise_and_result_audit — Recompute Event cardinality ORIGINAL distinct element slot1 with exact rational arithmetic, not rounded decimals.
  • S007 · premise_and_result_audit — Recompute Event cardinality ORIGINAL distinct element slot0 with exact rational arithmetic, not rounded decimals.
  • S006 · premise_and_result_audit — Reverse-check the ORIGINAL inputs,field roles,domain and premises.Consistency does not imply unique recovery of premises.Keep finite checking,independent review,formal proof and publication separate.
  • S005 · premise_and_result_audit — Reverse-check the ORIGINAL inputs,field roles,domain and premises.Consistency does not imply unique recovery of premises.Keep finite checking,independent review,formal proof and publication separate.
  • S004 · premise_and_result_audit — Reverse-check the ORIGINAL inputs,field roles,domain and premises.Consistency does not imply unique recovery of premises.Keep finite checking,independent review,formal proof and publication separate.
  • S003 · premise_and_result_audit — Reverse-check the ORIGINAL inputs,field roles,domain and premises.Consistency does not imply unique recovery of premises.Keep finite checking,independent review,formal proof and publication separate.
  • S002 · premise_and_result_audit — Reverse-check the ORIGINAL inputs,field roles,domain and premises.Consistency does not imply unique recovery of premises.Keep finite checking,independent review,formal proof and publication separate.
  • S001 · premise_and_result_audit — Reverse-check the ORIGINAL inputs,field roles,domain and premises.Consistency does not imply unique recovery of premises.Keep finite checking,independent review,formal proof and publication separate.

Result

2

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: 32b71645bae6d13874ca8c721250bac72c73272da2159436a02db4ad4bdf0be3
  • candidate record SHA-256: 4dadff3bf49c5e63e7bbf4fb8d304a4290d3c6393ebeab528c1b46d9347b8397
  • semantic review receipt SHA-256: 963099ffc9f754069fdce6792949a85ed350472465eaceb3038fa8011cf672bd
  • question-first witness SHA-256: d7655324c5d11528e1af90b757384cebd3313e19dc5f6f5b9b8ea7624fb06f6f
  • Lean: NOT_RUN · human review: NOT_PERFORMED
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