Exact-order witnesses for the prime divisors

On this page
  1. Goal and scope
  2. Givens and symbols
  3. Rules and sources
  4. Main derivation
  5. Substeps and lemmas
  6. Reverse audits
  7. Error controls and negative controls
  8. Result and limitations
  9. Verification and source binding

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derivation-mko-cauchy-theorem-finite-groups-01 · ocme-new142-reader-adoption-20261021

Goal and scope

In this six-element group, prime divisors 2,3 have exact-order witnesses s,r; there is no element of order 6.

Complete element-order enumeration in a specified finite model, not a general Cauchy proof.

Givens and symbols

  • calc
  • G1 — G={e,r,r2,s,rs,r2s}, encoded respectively (0,0),(1,0),(2,0),(0,1),(1,1),(2,1), with (i,j)(k,l)=(i+(-1)^j*k mod3,j+l mod2).
  • G — six-element group carrier
  • r,s — labels with r^3=e,s^2=e,sr=r^2s
  • p — prime divisor
  • \operatorname{ord}(g) — least positive identity-return exponent

Rules and sources

  • calc · prerequisite — Assume exact arithmetic modulo 3 and 2, extensional finite-set equality, and definitions of groups/actions; this operation is not pre-assumed to be a group.
  • mko_definition · cited — A complete Cayley table must certify G as a finite group, and p must be prime and divide |G|. There exists g with g^p=e while g^k≠e for every1≤k<p, hence ord(g)=p. Complete finite enumeration here supplies witnesses for a specified model, not a replacement for the general theorem proof. Do not extend the prime-divisor conclusion to every composite divisor d of |G|. · mko-cauchy-theorem-finite-groups

Main derivation

S01 · implies

Before

G=\{e,r,r^2,s,rs,r^2s\}

After

\begin{array}{c|cccccc}*&e&r&r^2&s&rs&r^2s\\\hline e&e&r&r^2&s&rs&r^2s\\r&r&r^2&e&rs&r^2s&s\\r^2&r^2&e&r&r^2s&s&rs\\s&s&r^2s&rs&e&r^2&r\\rs&rs&s&r^2s&r&e&r^2\\r^2s&r^2s&rs&s&r^2&r&e\\\end{array}

Conditions: none

Rule: calc · Uses: G1

Leaf basis: calc

Expand the pair formula for all 36 products; every output belongs to the same six-element carrier and no cell is missing.

S02 · implies

Before

(i,j)(k,l)=(i+(-1)^jk,j+l)\quad(\bmod(3,2))

After

((i,j)(k,l))(m,n)=(i+(-1)^jk+(-1)^{j+l}m,j+l+n)=(i,j)((k,l)(m,n));\quad e=(0,0);\quad(i,j)^{-1}=(-(-1)^ji,j)

Conditions: none

Rule: calc · Uses: G1, S01

Leaf basis: calc

Both bracketings have identical coordinates, proving associativity for all 216 triples; (0,0) is a two-sided identity and the inverse formula multiplies back on both sides.

S03 · implies

Before

|G|=6

After

6=2\cdot3,\quad2,3\text{ prime},\quad2\mid6,3\mid6

Conditions: none

Rule: calc · Uses: G1, S01, S02

Leaf basis: calc

The qualified group has six elements and prime divisors exactly 2 and 3, both meeting the theorem premise.

S04 · implies

Before

p=2,\quad g=s

After

s^1=s\ne e,\quad s^2=e\Rightarrow\operatorname{ord}(s)=2

Conditions: none

Rule: calc · Uses: G1, S01, S03

Leaf basis: calc

Check the only smaller positive exponent 1 and return at exponent 2, proving exact order 2 rather than merely g^2=e.

S05 · implies

Before

p=3,\quad g=r

After

r^1=r\ne e,\quad r^2\ne e,\quad r^3=e\Rightarrow\operatorname{ord}(r)=3

Conditions: none

Rule: calc · Uses: G1, S01, S03

Leaf basis: calc

Both smaller positive powers are nonidentity and the third returns, proving exact order 3.

S06 · implies

Before

g=e,r,r^2,s,rs,r^2s

After

\operatorname{ord}(g)=1,3,3,2,2,2\text{ respectively}

Conditions: none

Rule: calc · Uses: G1, S01, S02, S04, S05

Leaf basis: calc

Powers of r^2 are r^2,r,e; each reflection is nonidentity at power 1 and identity at power 2, completing all six orders.

S07 · implies

Before

6\mid|G|,\quad6\notin\{1,2,3\}

After

\nexists g\in G:\operatorname{ord}(g)=6

Conditions: none

Rule: calc · Uses: G1, S03, S06

Leaf basis: calc

The complete order table excludes an element of composite order 6, showing that the prime conclusion does not extend to every divisor.

S08 · implies

Before

p\in\{2,3\}\text{ prime divisor of }6

After

\exists g\in G:\ g^p=e\text{ and }g^k\ne e\ (1\le k<p)

Conditions: none

Rule: mko_definition · Uses: G1, S03, S04, S05, S06, S07

Leaf basis: mko_definition

Each prime has a full exact-order witness, certifying Cauchy instances in this model.

Substeps and lemmas

No substeps in this guide.

Reverse audits

  • S08 · premise_audit · G1, S03, S04, S05, S06, S07 — The theorem for all finite groups still requires a general proof, which this finite table does not replace.
  • S07 · premise_audit · G1, S03, S06 — Nonexistence follows from exhaustive enumeration, not a supposed Cauchy converse.
  • S06 · premise_audit · G1, S01, S02, S04, S05 — Every element appears once, not just the generators r,s.
  • S05 · premise_audit · G1, S01, S03 — r^3=e alone is insufficient: e also satisfies it but has order 1.
  • S04 · premise_audit · G1, S01, S03 — s and e are distinct table labels, excluding order 1.
  • S03 · premise_audit · G1, S01, S02 — 6 divides 6 but is not prime, so it cannot be the theorem's p.
  • S02 · premise_audit · G1, S01 — The sign depends only on j+l modulo 2 since (-1)^2=1; the full inverse list is e,r^2,r,s,rs,r^2s.
  • S01 · premise_audit · G1 — The six labels bind the six pairs; r^2 is not an additional seventh element.

Error controls and negative controls

Same group table

Bind every product, inverse and coset to this complete Cayley table.

Complete enumeration

Every universal finite property needs the full carrier or a universal formula, not a proper sample.

  • e^3=e makes e order 3. → reject — e^1=e, so its least positive return is 1.
  • 6 divides the group order, so an element has order 6. → reject — The full six-entry order table contains no 6.
  • One six-element example proves general Cauchy. → reject — It certifies the specified model, not the quantification over all groups.

Result and limitations

In this six-element group, prime divisors 2,3 have exact-order witnesses s,r; there is no element of order 6.

    Verification and source binding

    2 declared checks for this guide; only the listed expressions are covered.

    • source commit: b1b2f1dcf8c50d67a93fe52d95f8eef7b3abba9f
    • adopted source SHA-256: 9540176dd0ce1cca78a7c16996e5fc3ace68a2130c439dd5bdcc4779f164108a
    • original source SHA-256: 9540176dd0ce1cca78a7c16996e5fc3ace68a2130c439dd5bdcc4779f164108a
    • Lean: NOT_RUN · independent AI: SCOPED_LEAD_AND_BILINGUAL_CONTEXT_REVIEW

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