Corollary

Something given beyond what is actually due; something added or superfluous.

Something which occurs a fortiori, as a result of another effort without significant additional effort.

"Finally getting that cracked window fixed was a nice corollary of redoing the whole storefront."

A proposition which follows easily from the proof of another proposition.

"We have proven that this set is finite and well ordered; as a corollary, we now know that there is an order-preserving map from it to the natural numbers."

Occurring as a natural consequence or result; attendant; consequential.

Forming a proposition that follows from one already proved.