fn sub(a: &Self::BaseType, b: &Self::BaseType) -> Self::BaseType {
        [&a[0] - &b[0], &a[1] - &b[1]]
    }
Returns the component wise subtraction of `a` and `b`
crates/math/src/elliptic_curve/short_weierstrass/curves/bls12_377/field_extension.rs