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Corollaria

corollary, n. — a proposition that follows necessarily from one already proven.

how Corollaria works

A work
is a book published in volumes, each complete when it is published. Principia is one.
A volume
is what you read and what you own. Acquired once, it is yours to read without limit, on any device, with every revision that follows. Acquired before its day, it opens on that day.
An edition
is a volume in one language. Each is owned on its own, and two can be read side by side, passage by passage.
A set
is several volumes of a work, acquired together in one language. Philosophia is one.
A gift
is a volume or a set acquired for someone else. It is theirs when they sign in with the address it was sent to.
Every volume is signed and timestamped
when it is published, each revision chained to the one before. Anyone can check its publication record.

The name is the standard. The shelf is narrow, and lengthens only by what can be shown.