Low back painLow back pain (LBP) or lumbago is a common disorder involving the muscles, nerves, and bones of the back, in between the lower edge of the ribs and the lower fold of the buttocks. Pain can vary from a dull constant ache to a sudden sharp feeling. Low back pain may be classified by duration as acute (pain lasting less than 6 weeks), sub-chronic (6 to 12 weeks), or chronic (more than 12 weeks). The condition may be further classified by the underlying cause as either mechanical, non-mechanical, or referred pain.
Posterior probabilityThe posterior probability is a type of conditional probability that results from updating the prior probability with information summarized by the likelihood via an application of Bayes' rule. From an epistemological perspective, the posterior probability contains everything there is to know about an uncertain proposition (such as a scientific hypothesis, or parameter values), given prior knowledge and a mathematical model describing the observations available at a particular time.
Prior probabilityA prior probability distribution of an uncertain quantity, often simply called the prior, is its assumed probability distribution before some evidence is taken into account. For example, the prior could be the probability distribution representing the relative proportions of voters who will vote for a particular politician in a future election. The unknown quantity may be a parameter of the model or a latent variable rather than an observable variable.
Epic of King GesarThe Epic of King Gesar (), spelled Geser (especially in Mongolian contexts) or Kesar (ˈkɛzər,_ˈkɛs-), is a work of epic literature of Tibet and greater Central Asia. The epic originally developed around 200 BCE or 300 BCE and about 600 CE. Following this, folk balladeers continued to pass on the story orally; this enriched the plot and embellished the language. The story reached its final form and height of popularity in the early 12th Century. The Epic relates the heroic deeds of the culture hero Gesar, the fearless lord of the legendary kingdom of Ling ().
Chinese folk religionChinese folk religion, also known as Chinese popular religion, comprehends a range of traditional religious practices of Han Chinese, including the Chinese diaspora. Vivienne Wee described it as "an empty bowl, which can variously be filled with the contents of institutionalised religions such as Buddhism, Taoism, Confucianism and Chinese syncretic religions”. This includes the veneration of shen (spirits) and ancestors, exorcism of demonic forces, and a belief in the rational order of nature, balance in the universe and reality that can be influenced by human beings and their rulers, as well as spirits and deities.
Perturbation theory (quantum mechanics)In quantum mechanics, perturbation theory is a set of approximation schemes directly related to mathematical perturbation for describing a complicated quantum system in terms of a simpler one. The idea is to start with a simple system for which a mathematical solution is known, and add an additional "perturbing" Hamiltonian representing a weak disturbance to the system. If the disturbance is not too large, the various physical quantities associated with the perturbed system (e.g.
PaleolithicThe Paleolithic or Palaeolithic (ˌpeɪl-,_ˌpæliəʊˈlɪθɪk), also called the Old Stone Age (from Greek: παλαιός palaios, "old" and λίθος lithos, "stone"), is a period in human prehistory that is distinguished by the original development of stone tools, and which represents almost the entire period of human prehistoric technology. It extends from the earliest known use of stone tools by hominins, 3.3 million years ago, to the end of the Pleistocene, 11,650 cal BP.
Perturbation theoryIn mathematics and applied mathematics, perturbation theory comprises methods for finding an approximate solution to a problem, by starting from the exact solution of a related, simpler problem. A critical feature of the technique is a middle step that breaks the problem into "solvable" and "perturbative" parts. In perturbation theory, the solution is expressed as a power series in a small parameter . The first term is the known solution to the solvable problem. Successive terms in the series at higher powers of usually become smaller.
Wu (shaman)Wu () is a Chinese term translating to "shaman" or "sorcerer", originally the practitioners of Chinese shamanism or "Wuism" (巫教 wū jiào). The glyph ancestral to modern is first recorded in bronze script, where it could refer to shamans or sorcerers of either sex. Modern Mandarin wu (Cantonese mouh) continues a Middle Chinese mju or mjo. The Old Chinese reconstruction is uncertain, given as *mywo or as *myag, the presence of a final velar -g or -ɣ in Old Chinese being uncertain.
Optimization problemIn mathematics, computer science and economics, an optimization problem is the problem of finding the best solution from all feasible solutions. Optimization problems can be divided into two categories, depending on whether the variables are continuous or discrete: An optimization problem with discrete variables is known as a discrete optimization, in which an object such as an integer, permutation or graph must be found from a countable set.
