Idealism is nominalist since for it appearance is all the reality there is and objective truth is formed from local regimes of coherent beliefs. Appearances are not determined by something fixed which underlies them and so there can be and are in fact incompatible objective truths which maintain their conflictual coexistence expanding in mutual interpretation of each other without any horizon of ultimate resolution in favour of one or another. That we observe such conflicting regimes in many matters on a day to day basis thus constitutes evidence for idealism-nominalism. However, the opposition of realism and nominalism is one of the original instances of such a multiplicity (or duality) of truths and hence is itself irresolvable under either assumption.