`BookProof.TempleSeparationNecessary.neg_mem_spectrum_witness` (M : ℝ) : (-M) ∈ spectrum ℝ (witness M trial)

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`BookProof.TempleSeparationNecessary.neg_mem_spectrum_witness` (M : ℝ) : (-M) ∈ spectrum ℝ (witness M trial) · Prove2Me