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`BookProof.TensorCore.norm_tmul_sub_le` {E F : Type*} [NormedAddCommGroup E] [InnerProductSpace ℂ E] [NormedAddCommGroup F] [InnerProductSpace ℂ F] (x x' : E) (y y' : F) : ‖x ⊗ₜ[ℂ] · Prove2Me