phrase usage - "The same name" vs "a same name": what's the difference?

Since I'm confused with these two phrases, I did a search in Google Books hoping to find some examples. But then I found this paragraph:

Two private spaces or replicas cannot contain the same object with two distinct references. For example, during a disconnected phase, the pump can be present in two different private spaces and still be designated with the same name. During a meeting, two replicas use a same name to access the pump object(local or distant).

This made me more confused. I don't really understand why "the same name" was used in one sentence while "a same name" was used in another. Are there any differences between them?

Answer

A noun phrase (NP) can be definite or indefinite:

• One way to mark an NP as definite is to use the definite article the.


• One way to mark an NP as indefinite is to use the indefinite article a.

A speaker marks an NP as definite when they assume the listener will be able to identify what the NP refers to. They mark an NP as indefinite when they don't make this assumption.

Some other words have semantics that are only compatible with either definiteness or indefiniteness. For example, same is definite; if you use it, you're specifying what the NP it modifies is referring to. There are two possibilities:

• Same can indicate that the NP refers to something previously mentioned. In this case, the listener must be able to identify what that referent is.


• Same can indicate that two or more things co-refer (meaning they refer to the same thing). That means the listener is able to identify what these things refer to (each other), even if they don't know anything else about them and they haven't been previously mentioned. That's enough to count as definite in English.

Since same only make sense in definite contexts, it can combine with the, and it can't combine with a. For this reason, *a same name is not standard English.