A Formal Proof of Realism via Logical, Causal, and Empirical Closure

This paper presents a unified proof of metaphysical realism by demonstrating that all non-realist positions collapse under self-reference, causality, or empirical observation. Logical analysis shows that any denial of objective truth presupposes at least one objectively true proposition. Causal analysis defines existence as the capacity to affect or be affected, thereby grounding reality in interaction rather than perception. Empirical convergence between independent observers provides evidence of objective effects, establishing realism as the only framework consistent across logic, causality, and evidence. The argument closes the realism trilemma by uniting theoretical, practical, and observational domains under one ontological criterion: if anything exists, reality exists.