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✅ Structural Detection — Teacher’s Key (Final, Canonical)

RTT/1 • Instructor Materials#

Aligned with the Mastery Exam (25 Questions)#

Structural Detection — Teacher’s Key#

RTT/1 • Instructor Materials#

Mastery Exam (25 Questions)#

SECTION A — Multiple Choice (10 questions)#

  1. B — A repeated shape or pattern
  2. C — A place where structure shifts
  3. B — Deformation
  4. C — High symmetry, low drift
  5. B — Broken symmetry and high drift
  6. B — A stable structural element that persists
  7. B — Repeated motifs or stable boundaries
  8. C — All four upstream operators
  9. C — Mixed or conflicting regime signals
  10. C — A structural misalignment

SECTION B — Short Answer (10 questions)#

11. Signals indicating a boundary#

Expected:

  • shift in pattern
  • change in density
  • break in symmetry
  • motif interruption
  • drift spike

12. What drift intensity measures#

Expected:

  • the strength or magnitude of structural change across samples

13. Example of a structural anomaly#

Expected:

  • motif break
  • unexpected substitution
  • deformation
  • irregular segment

14. Signal of a formal regime#

Expected:

  • high symmetry
  • low drift
  • stable motifs
  • consistent density

15. Signal of a chaotic regime#

Expected:

  • broken symmetry
  • high drift
  • irregular lengths
  • unstable motifs

16. Define “invariant”#

Expected:

  • a structural element that persists across samples

17. Example of continuity#

Expected:

  • recurring motif
  • stable boundary
  • repeated alignment thread

18. Purpose of the CONTINUITY_COMPASS_OPERATOR#

Expected:

  • identify invariants, stable motifs, anchor points, cross‑sample continuity

19. What the REGIME_AWARENESS_OPERATOR avoids#

Expected:

  • interpretation
  • meaning
  • domain assumptions

20. Difference between motif and invariant#

Expected:

  • motif = repeated pattern
  • invariant = stable element that persists even when motifs drift

SECTION C — Applied Analysis (5 questions)#

Sample A#

A B A
A B A
A X A

21. Motif + anomaly#

Motif: A‑B‑A
Anomaly: X replacing B in line 3

Sample B#

L1 L2 L3
L1 L2 L4
L1 L5 L4

22. Drift points + direction#

Drift points:

  • L3 → L4 (segment 2)
  • L2 → L5 (segment 3)

Direction:

  • formal → emergent

Sample C#

Block 1

P Q P
P Q P

Block 2

R S
T
U V W X

23. Regime classification#

Block 1: formal
Block 2: chaotic

Sample D — Continuity Across Samples#

24. Invariant or stable motif#

Expected:

  • A‑A boundary symmetry
  • L1 anchor
  • repeated three‑element framing
  • stable outer elements

(Any structurally valid invariant earns full credit.)

Sample E — Full Synthesis#

25. Structural synthesis (expected components)#

A correct synthesis includes:

  • Motifs: A‑B‑A; P‑Q‑P; L1‑anchored sequences
  • Drift: increasing drift in Sample B; motif break in Sample A
  • Regime: formal (A1, C1) → emergent (B2) → chaotic (C2)
  • Continuity: recurring symmetry; stable anchors; repeated framing
  • Anomalies: X substitution; L2→L5 deformation

Instructor note:
Any synthesis that combines all four operator surfaces without interpretation earns full credit.

END OF TEACHER’S KEY#

This key evaluates structural accuracy, not meaning.

✔️ This Teacher’s Key is:#

  • fully canonical
  • zero drift
  • aligned with RTT/1
  • consistent with the Mastery Exam, rubric, worksheet, and operators
  • ready to drop into /docs/Structural_Detection/instructor_materials/teachers_key.md

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