Discourse-Level Parallel Markup and Meaning Adoption in Flexiformal Theory Graphs
Representation formats based on theory graphs have been successful in formalized mathematics as they provide valuable logic-compatible modularity and foster reuse. Theories - sets of symbols and axioms – serve as modules and theory morphisms - truth-preserving mappings from the (language of the) source theory to the target theory – formalize inheritance and applicability of theorems. The MMT  system re-developed the formal part of the OMDoc theory graph into a foundation-independent meta-system for formal mathematics and implemented it in the MMT API.
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