- Philosophy of Mathematics Semantic Realism: Why Mathematicians Mean What They Say Elaine Landry McGill University elaine@philo.mcgill.ca ABSTRACT: I argue that if we distinguish between ontological realism and semantic realism, then we no longer have to choose between platonism and formalism. If we take category theory as the language of mathematics, then a linguistic analysis of the content and ...www.bu.edu/wcp/Papers/Math/MathLand.htm