Groupprops:Voice

This article is part of the Groupprops Manual of Style
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Articles dealing with mathematical constructs and not with real-world entities

For these articles the following guidelines are observed regarding voice:

When the subject is a mathematical construct, then we typically use the active voice. The situations where we use passive voice are ones where we want to emphasize the verb or the object.
When the subject is a generic human being and the object is a mathematical construct, we prefer to use passive voice to avoid referring to the subject at all. If active voice is used, typically a first-person plural is plural is chosen for the subject.

Here the voice is chosen in accordance with the usual narrative style of historical documentation.