>>>Thank you all! Yet I cannot grasp the difference completely (rather subtle for my non-English ear), but surely I'm less confused now.
>>
>>Just an opinion: indefinite article sounds rather wrong to me. "Use to remove a member object from a collection." sounds like you can use that method to remove any member from any collection, which is not the case.
>
>It is the case. The Remove() method is not tied to one instance, but exists on every instance, and can be used on any of them.

But it is tied to one instance - *the* instance that invokes it.
'a' would only seem correct to me if (in .NET) there was a static method of the Collection type. e.g.:

Collection.Remove(collection,,element)

>The use case example changes it from "a" to "the" because you fill in the blanks.



>Until then it is "the function to remove a member object from a collection."
>
>
>> You can use it only on the members of THE collection you are mentioning, and no other.
>>
>>I guess the phrasing with the indefinite artcle is there just by inertia, blindly following the style used when describing functions:
>>

SIN( ) Function  
>>Returns the sine of an angle.