While hunting for information about how to construct the German possessive pronouns equivalent to "mine", "yours" etc., I found a page on the excellent Canoo website that seemed to contain the answer: You just take the pronoun stem (e.g. "mein") and append the last letter of the corresponding definite article (with a preceding "e" if the last letter is not already "e"), resulting in e.g. "meiner" for a masculine thing in the nominative case that belongs to me. Simple enough! [EDIT: Fixed case]
However... I then saw below that
Substitute for a noun, with article:
Possessive pronouns can be used as substitutes for nouns. When these substitutes are accompanied by a definite article, they are inflected like adjectives (cf. Adjectives, Weak inflection):
Der meine ist schneller als der deine
Der ihre ist schneller als der eure.
Wir leihen euch die unseren.
This has no English equivalent that I can think of, so I'm left wondering: When should this be used instead of the article-free equivalent?