(5.21)–(5.23) — e^{λt}φ(x) solves the delayed damped wave equation when φ is a Λ² eigenfunction and λ solves (5.23)

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(5.21)–(5.23) — e^{λt}φ(x) solves the delayed damped wave equation when φ is a Λ² eigenfunction and λ solves (5.23) · Prove2Me