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A drawing of twin mountains (Indonesian: pemandangan gunung kembar, "twin mountain view", or pemandangan gunung legendaris, "legendary mountain view") is a drawing pattern commonly made by Indonesian kindergarten and primary school students. The drawing is often produced by students who are asked by their teacher to draw natural features.
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The partially ordered set on the right (in red) is not a tree because x 1 < x 3 and x 2 < x 3, but x 1 is not comparable to x 2 (dashed orange line). A tree is a partially ordered set (poset) (T, <) such that for each t ∈ T, the set {s ∈ T : s < t} is well-ordered by the relation <. In particular, each well-ordered set (T, <) is a tree.
Suslin proved that if the complement of an analytic set is analytic then the set is Borel. (Conversely any Borel set is analytic and Borel sets are closed under complements.) Luzin proved more generally that any two disjoint analytic sets are separated by a Borel set: in other words there is a Borel set including one and disjoint from the other ...
Pocket set theory; Positive set theory; S (Boolos 1989) Scott–Potter set theory; Tarski–Grothendieck set theory; Von Neumann–Bernays–Gödel set theory; Zermelo–Fraenkel set theory; Zermelo set theory; Set (mathematics) Set-builder notation; Set-theoretic topology; Simple theorems in the algebra of sets; Subset; Θ (set theory) Tree ...
The coming years would see additional hand-drawn animated shorts: 1984's Sang Kancil dan Monyet (The Mousedeer and the Monkey) and a 1987 follow-up, Sang Kancil dan Buaya (The Mousedeer and the Crocodile); 1985's Gagak Yang Bijak (The Clever Crow); and Arnab Yang Sombong (The Proud Rabbit) and Singa Yang Haloba (The Greedy Lion) both released in 1986, all written and directed by Hassan Abd.
Kampung Boy is a Malaysian animated television series broadcast from 14 September 1999 to 12 September 2000. It is about the adventures of a young boy, Mat, and his life in a kampung (village). The series is adapted from the best-selling graphical novel The Kampung Boy , an autobiography of Malaysian cartoonist Lat .
Every tree in descriptive set theory is also an order-theoretic tree, using a partial ordering in which two sequences and are ordered by < if and only if is a proper prefix of . The empty sequence is the unique minimal element, and each element has a finite and well-ordered set of predecessors (the set of all of its prefixes).