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- TL;DR Summary
- I want to know that how Einstein came towards the idea of considering time as a coordinate in his theory.

We study metrics, in them, we take time as a coordinate. I mean to say that if time is a coordinate then in normal mathematical language, we can have negative coordinate values as well. This confuses me a lot as I want to see and understand the concept from the true physicist's perspective. Please help me understand it. I know some of you may find it funny, but I really need to clear myself up.