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Question 9367: Positive-Coefficient Monomial Tail Classes and Witnesses

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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R0017-09367 · q-20261013-advance-20261019-r06-asymptotic-resource-bound-0017

Original question and givens

Fix a cost model and explicit nonnegative functions f(n)=17*n^4, g(n)=3*n^0, with positive integer coefficients. Give (a, p, b, q, f∈O(g)?, f∈Ω(g)?, f∈Θ(g)?, prescribed O witness [a,1] or does-not-exist, prescribed Ω witness [1/b,1] or does-not-exist). Witnesses apply to the full tail n≥1, not samples.

  • G001 — Fix a cost model and explicit nonnegative functions f(n)=17*n^4, g(n)=3*n^0, with positive integer coefficients. Give (a, p, b, q, f∈O(g)?, f∈Ω(g)?, f∈Θ(g)?, prescribed O witness [a,1] or does-not-exist, prescribed Ω witness [1/b,1] or does-not-exist). Witnesses apply to the full tail n≥1, not samples.

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

fixed cost model;explicit nonnegative functions on natural n

After

O,Omega and Theta quantify positive constants over a full tail

Conditions: none

Fix the cost model and function family first.O requires C>0 and N with an upper bound for every n≥N;Omega is the corresponding positive lower bound,and Theta requires both.Finite measurements describe only a finite window.

Step identifiers and dependencies

Rule: full_tail_not_finite_benchmark_scope · Uses: G001

S002 · implies

Before

phase=prescribed monomials;positive coefficients=(17,3);exponents=(4,0);tail n>=1

After

O=No;Omega=Yes;Theta=No

Conditions: none

For n≥1 and p≤q,a*n^p≤a*n^q≤a*b*n^q,so prescribed C=a,N=1 works.For p≥q,n^q≤a*n^p,so prescribed c=1/b,N=1 works.In a failing direction the positive-power ratio is unbounded:for any C,N choose n≥max(N,1) and n>C*b/a;then n^(p−q)≥n violates the upper bound.For a failed lower bound interchange f and g.This is not a sample-based exponent inference.

Step identifiers and dependencies

Rule: monomial_full_tail_exponent_proof · Uses: G001, S001

S003 · implies

Before

O=No;Omega=Yes;a=17;b=3

After

prescribed O witness=does not exist;prescribed Omega witness=[1/3, 1]

Conditions: none

Retain the prescribed[a,1] and[1/b,1] witnesses even if tighter constants exist.Do not rewrite the1/b string;an impossible direction is marked does-not-exist.

Step identifiers and dependencies

Rule: prescribed_tail_witnesses_not_replaced · Uses: G001, S002

Reverse checks

  • 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 — Check against the original data and this step's premises; a one-way implication is not an equivalence.

Result

(17, 4, 3, 0, No, Yes, No, does-not-exist, [1/3, 1])

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: 26c4cdf56827c2afd4debfb424b8e93d5f02d9f97bd26526e5ea7abccc8275a7
  • candidate record SHA-256: afaa1b10581325e1ef91a738b55ccc8f277a83ab60e1ac12bc7bb9f3ea4a5d47
  • semantic review receipt SHA-256: abad28564830bb9b6ef069ca5a1aa128ce7b1a67a5cb8fe6d868a06db73bcfb8
  • question-first witness SHA-256: 43126988479968837abe086263dac1b24c37463ad80e00d2e280a7b8e9036a04
  • Lean: NOT_RUN · human review: NOT_PERFORMED
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