Hymenaea courbaril plasters, but at present its only use is for incense and varnish. The wood is very hard, measuring 5.6 on the Brinell scale and on the Janka scale, approximate measurements of hardness. For comparison, Douglas fir measures , white oak , and Brazilian walnut on the Janka scale. It features a tan to salmon color with black accent stripes that over time turn to a deep and vibrant red. Attribution: Hymenaea courbaril Hymenaea courbaril (courbaril and West Indian locust) is a tree common in the Caribbean, Central America, and South America. It is a hardwood that is used for furniture,
NP-hardness nor "Undecidable". For instance, the language of True quantified Boolean formulas is decidable in polynomial space, but not in non-deterministic polynomial time (unless NP = PSPACE). NP-hard problems do not have to be elements of the complexity class NP. As NP plays a central role in computational complexity, it is used as the basis of several classes: NP-hard problems are often tackled with rules-based languages in areas including: NP-hardness NP-hardness (non-deterministic polynomial-time hardness), in computational complexity theory, is the defining property of a class of problems that are, informally, "at least as hard as the hardest problems in NP". A