The Sign Problem of Yield Function in DP Model

[Arhejie]

Hello, I see in the code of DP_UMAT.m that the yield function of this constitutive model is "f = sqrt(2/3) * q_trial + B * p_trial - A". Leaving aside the coefficients, shouldn't the sign before "B*p_trial" be a negative sign? Are you using the sign rules in ABAQUS? I hope you can answer my doubts, thank you! @qizhang94