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Question 6867: Finite Distinct Points and Least Containing Closed Interval

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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R0012-06867 · q-20261010-advance-20261014-r02-real-number-0042

Original question and givens

Use an exact finite rational-point slice embedded in R, without approximate decimals or a completeness claim. Ordered points=[-16/2, 0/1, 17/3]. Give (increasing distinct points, minimum lo, maximum hi, hi−lo); the containing interval is [lo,hi], not the point set’s topological closure.

  • G001 — Use an exact finite rational-point slice embedded in R, without approximate decimals or a completeness claim. Ordered points=[-16/2, 0/1, 17/3]. Give (increasing distinct points, minimum lo, maximum hi, hi−lo); the containing interval is [lo,hi], not the point set’s topological closure.

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

explicit rational points embedded in the real line

After

exact finite order and distance data,not real completeness or irrational classification

Conditions: none

Use exact rational values for this finite slice of the real line,without rounded decimals or claims about real completeness or classification of irrationals.

Step identifiers and dependencies

Rule: rational_real_slice_scope · Uses: G001

S002 · implies

Before

[[-16, 2], [0, 1], [17, 3]]

After

[-8/1, 0/1, 17/3]

Conditions: none

Sort and deduplicate by rational value,not fraction strings;0/−2 and0/3 represent the same point0.

Step identifiers and dependencies

Rule: rational_point_numeric_normalization · Uses: G001, S001

S003 · calculation

Before

smallest containing interval width := sub(17/3, -8)

After

smallest containing interval width = 41/3

Conditions: none

Rightmost minus leftmost point gives the nonnegative interval width.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S002

S004 · implies

Before

all points between -8 and 17/3

After

smallest containing closed interval=[-8,17/3]

Conditions: none

Every containing closed interval must include the smallest and largest points,hence this interval is minimal.This is not a claim that topological closure fills the gaps of a finite point set.

Step identifiers and dependencies

Rule: containing_interval_not_topological_closure · Uses: G001, S003

Reverse checks

  • S004 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S003 · premise_and_result_audit — Recompute smallest containing interval width with exact rational arithmetic, not rounded decimals.
  • 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 — Check against the original data and this step's premises; a one-way implication is not an equivalence.

Result

([-8/1, 0/1, 17/3], -8/1, 17/3, 41/3)

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: 7459c0162c4037fae5fc8f8499488578daa183a2292fc2d85ccf5b5f801ff59d
  • candidate record SHA-256: 4c43361d02f833e2f4bf81472aea228184b9dc8cb08f6749dd7ddb4709f0d735
  • semantic review receipt SHA-256: 90dbc494b2d34ef51f412dcff63cfcc1a2215d038bff71f38f5dded4c64faf00
  • question-first witness SHA-256: b72a3b8bcf10f584396e0dd5198c657b0934a71864e5a3fa6321d7a613aef9f9
  • Lean: NOT_RUN · human review: NOT_PERFORMED
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