and Ozawa relations we obtain ε ε A η η B + ε ε A σ σ B + σ σ A η η B + σ σ A σ σ B ≥ ≥ | ⟨ [ A ^ ^ , B ^ ^ ] ⟩ | . The four terms can be written as: ( ε ε A + σ σ A ) ( η η B + σ σ B ) ≥ ≥ | ⟨ [ A ^ ^ , B ^ ^ ] ⟩ | . Defining: ε ε ¯ ¯ A ≡ ≡ ( ε ε A + σ σ A ) as the inaccuracy in the measured values of the variable A and η η ¯ ¯ B ≡ ≡ ( η η B + σ σ B ) as the resulting fluctuation in the conjugate variable B, Kazuo Fujikawa established an uncertainty relation similar to the Heisenberg original one, but valid both for systematic and statistical errors :