There are so many novel usages of references, IDs, keys, codes:
If we substitute variable a in the equation (3) with string "ABC" at the address 0x801234 as pointed by Smith [SM2005] we might crash our database Prometheus located in the zone us-west-2.
We might fail test 3 in the trial AA5.
Please open book 2 paragraph 14 section 3.
I could not find grammar describing the topic, particular:
- what part of speech is it? Aren't they determiners?
- why does it come after the noun (street addresses usually use numbers as premodifiers, though we say November 7, 2021)?
- as reference/label/code identify an entity I see no reason for use of definite article...