Explore related knowledge and questions →

Question 26623: Coordinatewise Convex Weights Keep the Entire Path in the Box

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

Return to catalogue page 134

← Question derivation index · Original question batch

R0052-26623 · q-20261015-advance-20261117-r06-path-connected-space-0048

Original question and givens

Use coordinate bounds lower=[-24, -25, -26],upper=[25, 26, 27], start=[-23, -24, -25],end=[24, 25, 26]. Give (lower, upper, start, end, coordinate_formulas, range_certificate, certificate).

  • G001 — Use coordinate bounds lower=[-24, -25, -26],upper=[25, 26, 27], start=[-23, -24, -25],end=[24, 25, 26]. Give (lower, upper, start, end, coordinate_formulas, range_certificate, 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 roles = [path-box-linear]

After

derived = [[lower, upper, start, end, formulas, continuous_path, certificate]]

Conditions: none

List this operation/mode exact source field order without JavaScript.Keep Boolean,string and null roles distinct;do not pad fields or infer the interface from answer shape.

Step identifiers and dependencies

Rule: source_ordered_fields_without_JS · Uses: G001

S002 · implies

Before

source roles = [[-24, -25, -26], [25, 26, 27], [-23, -24, -25], [24, 25, 26]]

After

derived = [3, Yes]

Conditions: none

Check both endpoints against each coordinate interval with matching dimensions.Degenerate coordinates and reverse orientation are allowed.

Step identifiers and dependencies

Rule: Path_ALL_coordinate_endpoint_premises · Uses: G001, S001

S003 · calculation

Before

Path coordinate0 ORIGINAL end minus start := sub(24, -23)

After

Path coordinate0 ORIGINAL end minus start = 47

Conditions: none

Substitute the original roles exactly,retaining symbolic operations;no floating approximation or extra source-domain restriction.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S002

S004 · implies

Before

source roles = [0, -24, 25, -23, 24, 47]

After

derived = [gamma_i(t)=(1-t)*start_i+t*end_i, 0<=t<=1, -24, 25, -23, 24]

Conditions: none

For every t in[0,1],weights(1-t),t are nonnegative and sum to1.Thus this coordinate lies between its endpoints and within its bounds;the affine coordinate is continuous,not merely endpoint-checked.

Step identifiers and dependencies

Rule: Path_WHOLE_coordinate_convex_range_and_continuity · Uses: G001, S003

S005 · calculation

Before

Path coordinate1 ORIGINAL end minus start := sub(25, -24)

After

Path coordinate1 ORIGINAL end minus start = 49

Conditions: none

Substitute the original roles exactly,retaining symbolic operations;no floating approximation or extra source-domain restriction.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S004

S006 · implies

Before

source roles = [1, -25, 26, -24, 25, 49]

After

derived = [gamma_i(t)=(1-t)*start_i+t*end_i, 0<=t<=1, -25, 26, -24, 25]

Conditions: none

For every t in[0,1],weights(1-t),t are nonnegative and sum to1.Thus this coordinate lies between its endpoints and within its bounds;the affine coordinate is continuous,not merely endpoint-checked.

Step identifiers and dependencies

Rule: Path_WHOLE_coordinate_convex_range_and_continuity · Uses: G001, S005

S007 · calculation

Before

Path coordinate2 ORIGINAL end minus start := sub(26, -25)

After

Path coordinate2 ORIGINAL end minus start = 51

Conditions: none

Substitute the original roles exactly,retaining symbolic operations;no floating approximation or extra source-domain restriction.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S006

S008 · implies

Before

source roles = [2, -26, 27, -25, 26, 51]

After

derived = [gamma_i(t)=(1-t)*start_i+t*end_i, 0<=t<=1, -26, 27, -25, 26]

Conditions: none

For every t in[0,1],weights(1-t),t are nonnegative and sum to1.Thus this coordinate lies between its endpoints and within its bounds;the affine coordinate is continuous,not merely endpoint-checked.

Step identifiers and dependencies

Rule: Path_WHOLE_coordinate_convex_range_and_continuity · Uses: G001, S007

Reverse checks

  • S008 · premise_and_result_audit — Reverse-check the complete original data,types,field order and premises;finite audits are not formal proofs of infinite theorems.
  • S007 · premise_and_result_audit — Recompute Path coordinate2 ORIGINAL end minus start with exact rational arithmetic, not rounded decimals.
  • S006 · premise_and_result_audit — Reverse-check the complete original data,types,field order and premises;finite audits are not formal proofs of infinite theorems.
  • S005 · premise_and_result_audit — Recompute Path coordinate1 ORIGINAL end minus start with exact rational arithmetic, not rounded decimals.
  • S004 · premise_and_result_audit — Reverse-check the complete original data,types,field order and premises;finite audits are not formal proofs of infinite theorems.
  • S003 · premise_and_result_audit — Recompute Path coordinate0 ORIGINAL end minus start with exact rational arithmetic, not rounded decimals.
  • S002 · premise_and_result_audit — Reverse-check the complete original data,types,field order and premises;finite audits are not formal proofs of infinite theorems.
  • S001 · premise_and_result_audit — Reverse-check the complete original data,types,field order and premises;finite audits are not formal proofs of infinite theorems.

Result

([-24, -25, -26], [25, 26, 27], [-23, -24, -25], [24, 25, 26], [-23+(47)t, -24+(49)t, -25+(51)t], Yes, coordinatewise_convex_combination_stays_in_box)

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: 175d6b22d3b0375b1c1e1c4c669368b59a5e1b143fba7c095b9bc95e35a3b8b4
  • candidate record SHA-256: e6e28da059c942766e9f9e1d849954350ee9400b6fd2df4ac1209cfdf657ff98
  • semantic review receipt SHA-256: 729b25cbf6bf5cb1d07a21a511ae216ec5fdd54a4a7aa2f7c21156b81ff37252
  • question-first witness SHA-256: d1ab788770eaad04f986986e65afb0d55791e8a8c0d747e9a2b499f79fe78df2
  • Lean: NOT_RUN · human review: NOT_PERFORMED
Same-source full JSON