single-letter matrix
71Pauli matrices — The Pauli matrices are a set of 2 times; 2 complex Hermitian and unitary matrices. Usually indicated by the Greek letter sigma (σ), they are occasionally denoted with a tau (τ) when used in connection with isospin symmetries. They are::sigma 1 =… …
72Natural deduction — In logic and proof theory, natural deduction is a kind of proof calculus in which logical reasoning is expressed by inference rules closely related to the natural way of reasoning. This contrasts with the axiomatic systems which instead use… …
73Avril Lavigne — Lavigne playing her Telecaster …
74Logicism — is one of the schools of thought in the philosophy of mathematics, putting forth the theory that mathematics is an extension of logic and therefore some or all mathematics is reducible to logic.[1] Bertrand Russell and Alfred North Whitehead… …
75Harry S. Truman — This article is about the United States president. For other uses of the name, see Harry Truman (disambiguation). Harry Truman 33rd President of the United States …
76Word Up (video game) — Word Up also known as Word Soup is a popular SWP (skill with prizes) game which can be found in around 40%Fact|date=March 2008 of the pubs in Great Britain. Located on the itbox and other terminals, the game was developed by Big Fizz Games in… …
77spectroscopy — spectroscopist /spek tros keuh pist/, n. /spek tros keuh pee, spek treuh skoh pee/, n. the science that deals with the use of the spectroscope and with spectrum analysis. [1865 70; SPECTRO + SCOPY] * * * Branch of analysis devoted to identifying… …
78intelligence, human — ▪ psychology Introduction mental quality that consists of the abilities to learn from experience, adapt to new situations, understand and handle abstract concepts, and use knowledge to manipulate one (human being) s environment. Much of… …
79Diode — Figure 1: Closeup of a diode, showing the square shaped semiconductor crystal (black object on left) …
80Holy Wood (In the Shadow of the Valley of Death) — Holy Wood (In the Shadow of the Valley of Death) …
