In many scientific papers, the article before the word "Equation" is omitted. Is there any grammar statement behind this? For instance:
"Equation (8) contains various approximations, and we have to check their consistency."
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Try thinking of "Equation (8)" as the name (identifier) of the equation, just as your name (identity) is "freude".
You would expect someone to refer to you just by your name, as "freude" - you wouldn't expect them to refer to you as "the freude". Similarly, you refer to Equation (8) as "Equation (8)" because that is its name.