`BookProof.FriedrichsCanonical.exists_formExt_eq` {P : PosSymOp F} {v : F} (hv : v ∈ formDomain P) : ∃ k : FormSpace P, formExt P k = v

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`BookProof.FriedrichsCanonical.exists_formExt_eq` {P : PosSymOp F} {v : F} (hv : v ∈ formDomain P) : ∃ k : FormSpace P, formExt P k = v · Prove2Me