John Fraser (botanist) of botany and natural science." Species named after Fraser include, among others, "Abies fraseri" (Fraser Fir), "Magnolia fraseri" (Fraser Magnolia), and the gentianworts, "Frasera". A 50-foot Fraser Fir was used in 1998 as the U.S. Capitol Christmas Tree; the species was also used in 1974. The Fraser's Saint John's wort ("Triadenum fraseri") is named in honour of Fraser. John Fraser's letters are maintained at the Royal Society of Arts, and one of his portraits hung at the Hunt Library. Both Hoppner and Raeburn painted his portrait. Fraser was an elected fellow of both the Linnean Society of London (FLS 1810)
Tree automaton three statements are equivalent: Tree automaton A tree automaton is a type of state machine. Tree automata deal with tree structures, rather than the strings of more conventional state machines. The following article deals with branching tree automata, which correspond to regular languages of trees. As with classical automata, finite tree automata (FTA) can be either a deterministic automaton or not. According to how the automaton processes the input tree, finite tree automata can be of two types: (a) bottom up, (b) top down. This is an important issue, as although non-deterministic (ND) top-down and ND bottom-up tree automata are