References

IXE

Landmark IX-E: Binary time ordering and causal subtraction on the declared sharp comparison sector. Supplied manuscript IX-E.tex. Used for the fixed-domain obstruction and the distinction between the commutator gate and the complete causal interface.

IXE2

Landmark IX-E-2: Exact imaginary part of the locked Cauchy kernel and the first-stage commutator on the retained two-way sector. Supplied manuscript. Used for the evaluated kernel, commutator, compact detection, witness zero, observation-spacelike control, derivative-support characterization, and conjugate reversal identity.

VIIB

Landmark VII-B. Sharp adjoint statement as quoted in the supplied IX-E-3 specification. Only the displayed adjoint and surface coefficient are imported. An unprovided defining kernel for the inherited ${\mathsf{E}}_0$ is not reconstructed.

Ivrii

V. Ivrii, Partial Differential Equations, Chapter 9, Section 9.1, “Wave equation in dimensions $3$ and $2$.” University of Toronto online lecture text. Used for the standard flat Kirchhoff realization and its sphere-supported propagation, not to identify an unspecified internal operator.