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Obsidian (/ əbˈsɪdi.ən, ɒb -/ əb-SID-ee-ən ob-) [5] is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth. It is an igneous rock. [6] Obsidian is produced from felsic lava, rich in the lighter elements such as silicon, oxygen, aluminum, sodium, and potassium.
Alexithymia (/ əˌlɛksɪˈθaɪmiə / ə-LEK-sih-THY-mee-ə), also called emotional blindness, [1] is a neuropsychological phenomenon characterized by significant challenges in recognizing, expressing, sourcing, [2] and describing one's emotions. [3][4][5] It is associated with difficulties in attachment and interpersonal relations. [6]
Publication date. 1953. " A Good Man Is Hard to Find " is a Southern gothic short story first published in 1953 by author Flannery O'Connor who, in her own words, described it as "the story of a family of six which, on its way driving to Florida [from Georgia], is slaughtered by an escaped convict who calls himself the Misfit".
Such a function is hard to invert unless some secret information, called the trapdoor, is known. A collision-free hash function f is a one-way function that is also collision-resistant; that is, no randomized polynomial time algorithm can find a collision—distinct values x, y such that f(x) = f(y)—with non-negligible probability. [4]
ASL & Speech therapy. In aphasia (sometimes called dysphasia), [a] a person may be unable to comprehend or unable to formulate language because of damage to specific brain regions. [2] The major causes are stroke and head trauma; prevalence is hard to determine, but aphasia due to stroke is estimated to be 0.1–0.4% in the Global North. [3]
Hard water. A bathtub faucet with built-up calcification from hard water in Southern Arizona. Hard water is water that has a high mineral content (in contrast with "soft water"). Hard water is formed when water percolates through deposits of limestone, chalk or gypsum, [1] which are largely made up of calcium and magnesium carbonates ...
The P versus NP problem is a major unsolved problem in theoretical computer science. Informally, it asks whether every problem whose solution can be quickly verified can also be quickly solved. Here, "quickly" means an algorithm that solves the task and runs in polynomial time exists, meaning the task completion time is bounded above by a ...
NP-hard. Class of problems which are at least as hard as the hardest problems in NP. Problems that are NP-hard do not have to be elements of NP; indeed, they may not even be decidable. NP-complete. Class of decision problems which contains the hardest problems in NP. Each NP-complete problem has to be in NP.