👉 In mathematics, a subsynodal is an element of a ring or field that is not invertible. In other words, it's a non-invertible element in the ring or field under consideration. A subring is a subset of a ring that contains its zero element and has no multiplicative inverse. A subfield is a subset of a field that contains all its elements except for 0 (the additive identity). In the context of a ring, a subsynodal is an