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Second partial derivative of φ with respect to δ

Values for calculation

n
δ
I
τ
J
\text{Region}

Calculation

Second partial derivative of φ with respect to δ

\text{if }\ \text{Region}= 3
φ_{δδ}=-n[1]\cdot δ^{-2}+\sum_{i=2}^{40}{n[i]\cdot I[i]\cdot\left(I[i]-1\right)\cdot δ^{I[i]-2}\cdot τ^{J[i]}}
\text{else}
φ_{δδ}=0