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σ 0 = ⟨ σ m ⟩ ≈ ∫ 0 ε 0 d ε 0 { 2 κ n ( ε 0 ) − n ( ∞ ) n ( 0 ) − n ( ∞ ) + α [ v p ( ε 0 ) − v p max ( ε 0 ) ] } {\displaystyle \sigma _{0}=\langle \sigma _{m}\rangle \approx \int _{0}^{\varepsilon _{0}}{\rm {d}}\varepsilon _{0}\left\lbrace 2\kappa {\frac {n(\varepsilon _{0})-n(\infty )}{n(0)-n(\infty )}}+\alpha \left[v_{p}(\varepsilon _{0})-v_{p}^{\max(}\varepsilon _{0})\right]\right\rbrace }
![{\displaystyle \sigma _{0}=\langle \sigma _{m}\rangle \approx \int _{0}^{\varepsilon _{0}}{\rm {d}}\varepsilon _{0}\left\lbrace 2\kappa {\frac {n(\varepsilon _{0})-n(\infty )}{n(0)-n(\infty )}}+\alpha \left[v_{p}(\varepsilon _{0})-v_{p}^{\max(}\varepsilon _{0})\right]\right\rbrace }](https://wikimedia.org/api/rest_v1/media/math/render/svg/32fb8e619d3c197e6d8cec45da4efa89375dd829)