No, the comment above mine is the one being pedantic. We can absolutely talk about physical correspondence of mathematical concepts, even though there are multiple equally good logical systems for describing them.
Relations are functions.
Can you tell us more about this function which relates Mathematical concepts to physical reality?
That is how they are defined in set theory based math. The mathematical definition is not the only meaning of a word. When when start to talk about the physical world, we need additional concepts. You are welcome to read the wikipedia page about correspondence theories of truth.
If you are going to talk about the correspondence theory in the same breath as you are talking about any language - you need to solve the symbol-grounding problem.
What function/mechanism/relation (or if you don't like any of those words - pick your own) grounds symbols?