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Answer Key — Classical PDEs in one space dimension

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Partial differential equations

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Worksheets — Sets 1–10

| Set | Guidance | | --- | --- | | Set 1 | Classical PDEs in one space dimension — verify written work and accept reasonable drawings. | | Set 2 | Classical PDEs in one space dimension — verify written work and accept reasonable drawings. | | Set 3 | Classical PDEs in one space dimension — verify written work and accept reasonable drawings. | | Set 4 | Classical PDEs in one space dimension — verify written work and accept reasonable drawings. | | Set 5 | Classical PDEs in one space dimension — verify written work and accept reasonable drawings. | | Set 6 | Classical PDEs in one space dimension — verify written work and accept reasonable drawings. | | Set 7 | Classical PDEs in one space dimension — verify written work and accept reasonable drawings. | | Set 8 | Classical PDEs in one space dimension — verify written work and accept reasonable drawings. | | Set 9 | Classical PDEs in one space dimension — verify written work and accept reasonable drawings. | | Set 10 | Classical PDEs in one space dimension — verify written work and accept reasonable drawings. |

Worksheets — Sets 11–20

| Set | Guidance | | --- | --- | | Set 11 | Classical PDEs in one space dimension — verify written work and accept reasonable drawings. | | Set 12 | Classical PDEs in one space dimension — verify written work and accept reasonable drawings. | | Set 13 | Classical PDEs in one space dimension — verify written work and accept reasonable drawings. | | Set 14 | Classical PDEs in one space dimension — verify written work and accept reasonable drawings. | | Set 15 | Classical PDEs in one space dimension — verify written work and accept reasonable drawings. | | Set 16 | Classical PDEs in one space dimension — verify written work and accept reasonable drawings. | | Set 17 | Classical PDEs in one space dimension — verify written work and accept reasonable drawings. | | Set 18 | Classical PDEs in one space dimension — verify written work and accept reasonable drawings. | | Set 19 | Classical PDEs in one space dimension — verify written work and accept reasonable drawings. | | Set 20 | Classical PDEs in one space dimension — verify written work and accept reasonable drawings. |

Review tiers 1–10

  • Checklists are parent-judged.
  • Written items: verify against practice set patterns.
  • Standard text: Heat equation on a finite rod; Fourier sine/cosine series solutions Wave equation on a finite interval; d'Alembert's formula (1D) Vibrating string and heat conduction interpretations Steady-state solutions and equilibrium limits Inhomogeneous problems via eigenfunction expansion (introduction)

Practice test scoring

| Tier | Pass guidance | | --- | --- | | 1–3 | Most oral tasks smooth; majority of written correct | | 4–6 | 7/10+ total with clear understanding | | 7–8 | 9/12+ with explanations | | 9–10 | Near-perfect; ready to move on |

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