Function SCIPexprcurvPowerInv 

pub unsafe extern "C" fn SCIPexprcurvPowerInv(
    basebounds: SCIP_INTERVAL,
    exponent: f64,
    powercurv: SCIP_EXPRCURV,
) -> SCIP_EXPRCURV

gives required curvature for base so that base^exponent has given curvature under given bounds on base and constant exponent

returns curvature unknown if expected curvature cannot be obtained