I don't think you could call it a controversy, and I'll give the same answer I gave in the other thread.
If you look up "science" in your dictionary you'll see that it has multiple definitions. When defining mathematics, the dictionary is using a different definition of science than the one that applies to physics, chemistry and biology. For mathematics, they're using this definition of science:
A branch of knowledge of study, esp. one concerned with establishing and systematizing facts [the science of mathematics]
In other words, they're using science in the sense of the science of cartography, or the science of military strategy, or computer science. For sciences like biology, physics, astronomy and so forth you want this definition:
Systematized knowledge derived from observation, study, and experimentation carried on in order to determine the nature or principles of what is being studied.
To clarify a bit more, sciences like physics, astronomy and biology possess the qualities of replicability and tentativity. Mathematics does not possess this latter quality.
What we traditionally call the sciences represent our efforts to understand the natural world through observation and experimentation. Mathematics is an abstraction that exists independent of any natural world.
Last, and probably least, if mathematics was a science it would be part of the science curriculum in schools and universities.
--Percy