Fire
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Incinerating, combusting, inflamed, burning. Also, ablaze.
the solution set
That would be the "solution" to the set of equations.
A relation is a mapping from one set to another. It is a function if elements of the first set are mapped to only one element from the second set. So, for example, square root is not a function because 9 can be mapped to -3 and 3.
natural numbers!!