Does "unioned" exist in the context of math?

In mathematics, if you have the sets A and B, you can build a new set C which is the union of A and B. I would like to say, something like

Set C consists of the unioned sets A and B.

but the form "unioned" doesn't seem to exist. But what do I say then? united? Sounds so strange in that context...

Solution 1:

I have not seen the term unioned before in an academic context, and such usage appears to be rare. Mathematical (and other scientific) papers will often use the term Set C consists of the union of sets A and B or a similar phrasing to describe your example.

For example, the search term "unioned" on Google Scholar returns ~4000 hits. In comparison, the search term "union of" sets returns ~2 million hits.

While it may be understandable as an obvious verb-form neologism, it is definitely not commonly used, and there is no need to coin the verb-form since a much less awkward sounding version already exists.

Solution 2:

In my math classes, it was always said, "Sets A and B combine to form set C." The verb used was "to combine," not "to union." I've never heard of "to union."

Solution 3:

It's used in a surgical context quite a lot to describe how well the borders of a skin wound have "unioned" together after a suture repair. The opposing skin borders of a previously repaired wound that has undergone a dehiscence are said to be non-unioning.