word usage - What preposition should one use with "redundant"?

I realize it's usually better to just say "A and B are redundant". But, I've also seen

• A is redundant with B


• ... to B


• ... of B

all with basically the same intended meaning. Are any of these more (or less) correct?

Answer

The correct idiom is:

A is redundant with B.

Google hit counts confirm that "redundant with" is by far the preferred usage:

• "redundant with" — 310,000 results


• "redundant of" — 45,900 results

"Redundant to" actually shows more results that "redundant with", but the vast majority of those are actually "redundant" followed by an infinitive, eg. "It is redundant to specify both height and width."