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–Daily Celebrity Crossword – 7/23/19 TV Tuesday
–Universal Crossword – May 14 2019
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A rare species is a group of organisms that are very uncommon, scarce, or infrequently encountered. This designation may be applied to either a plant or animal taxon, and may be distinct from the term endangered or threatened species. Designation of a rare species may be made by an official body, such as a national government, state, or province. However, the term more commonly appears without reference to specific criteria. The IUCN does not normally make such designations, but may use the term in scientific discussion.
Rarity rests on a specific species being represented by a small number of organisms worldwide, usually fewer than 10,000. However, a species having a very narrow endemic range or fragmented habitat also influences the concept. Rare species are not uncommon, since nearly 75% of known species are rare.
A species may be endangered or vulnerable, but not considered rare if—for example—it has a large, dispersed population, but its numbers are declining rapidly or predicted to do so. Rare species are generally considered threatened because a small population size is more likely to not recover from stochastic events (things that could happen).
Parity is a mathematical term that describes the property of an integer’s inclusion in one of two categories: even or odd. An integer is even if it is ‘evenly divisible’ by two (the old-fashioned term “evenly divisible” is now almost always shortened to “divisible”) and odd if it is not even. For example, 6 is even because there is no remainder when dividing it by 2. By contrast, 3, 5, 7, 21 leave a remainder of 1 when divided by 2. Examples of even numbers include −4, 0, 8, and 1738. In particular, zero is an even number. Some examples of odd numbers are −5, 3, 9, and 73.
A formal definition of an even number is that it is an integer of the form n = 2k, where k is an integer; it can then be shown that an odd number is an integer of the form n = 2k + 1. It is important to realize that the above definition of parity applies only to integer numbers, hence it cannot be applied to numbers like 1/2, 4.201. See the section “Higher mathematics” below for some extensions of the notion of parity to a larger class of “numbers” or in other more general settings.
The following outline is provided as an overview of and topical guide to psychology:
Psychology is the science of behavior and mental processes. Its immediate goal is to understand individuals and groups by both establishing general principles and researching specific cases.
The most prominent schools are in bold.
History of psychology
List of psychological research methods
The following tables provide a comparison of computer algebra systems (CAS). A CAS is a package comprising a set of algorithms for performing symbolic manipulations on algebraic objects, a language to implement them, and an environment in which to use the language. A CAS may include a user interface and graphics capability; and to be effective may require a large library of algorithms, efficient data structures and a fast kernel.
These computer algebra systems are sometimes combined with “front end” programs that provide a better user interface, such as the general-purpose GNU TeXmacs.
Below is a summary of significantly developed symbolic functionality in each of the systems.
Those which do not “edit equations” may have a GUI, plotting, ASCII graphic formulae and math font printing. The ability to generate plaintext files is also a sought-after feature because it allows a work to be understood by people who do not have a computer algebra system installed.