 The issues Neurath addressed resonated with ongoing philosophical debates over equality in mathematical equations, identity, definitions, analyticity, axiomatization and conceptual analysis. In addition to the theme of univocality, a second enduring theme that appeared first in the logic writings was the semiotic, or notational, and typographic approach to the conventional introduction and organization of symbols, especially the linear, one-dimensional character of typographic arrangements. The ideas and perspectives he developed in the logic writings played a role in his subsequent discussions of economics, decision-making, scientific theorizing through combinatorial classifications and the epistemological and methodological contributions to logical empiricism.