In propositional logic, affirming the consequent, sometimes called converse error, fallacy of the converse, or confusion of necessity and sufficiency, is a formal fallacy of taking a true conditional statement under certain assumptions, and invalidly inferring its converse, even though that statement may not be true under the same assumptions. This arises when the consequent has other possible antecedents.
In logic and related fields such as mathematics and philosophy, "if and only if" is paraphrased by the biconditional, a logical connective between statements. The biconditional is true in two cases, where either both statements are true or both are false. The connective is biconditional, and can be likened to the standard material conditional combined with its reverse ("if"); hence the name. The result is that the truth of either one of the connected statements requires the truth of the other, though it is controversial whether the connective thus defined is properly rendered by the English "if and only if"—with its pre-existing meaning. For example, P if and only if Q means that P is true whenever Q is true, and the only case in which P is true is if Q is also true, whereas in the case of P if Q, there could be other scenarios where P is true and Q is false.
K, or k, is the eleventh letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is kay, plural kays.
Q, or q, is the seventeenth letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is pronounced, most commonly spelled cue, but also kew, kue and que.
RSA (Rivest–Shamir–Adleman) is a public-key cryptosystem, one of the oldest widely used for secure data transmission. The initialism "RSA" comes from the surnames of Ron Rivest, Adi Shamir and Leonard Adleman, who publicly described the algorithm in 1977. An equivalent system was developed secretly in 1973 at Government Communications Headquarters (GCHQ), the British signals intelligence agency, by the English mathematician Clifford Cocks. That system was declassified in 1997.
In mathematics, a binary operation is commutative if changing the order of the operands does not change the result. It is a fundamental property of many binary operations, and many mathematical proofs depend on it. Perhaps most familiar as a property of arithmetic, e.g. "3 + 4 = 4 + 3" or "2 × 5 = 5 × 2", the property can also be used in more advanced settings. The name is needed because there are operations, such as division and subtraction, that do not have it ; such operations are not commutative, and so are referred to as noncommutative operations. The idea that simple operations, such as the multiplication and addition of numbers, are commutative was for many years implicitly assumed. Thus, this property was not named until the 19th century, when mathematics started to become formalized. A similar property exists for binary relations; a binary relation is said to be symmetric if the relation applies regardless of the order of its operands; for example, equality is symmetric as two equal mathematical objects are equal regardless of their order.
P. D. Q. Bach is a fictional composer created by the American composer and musical satirist Peter Schickele for a five-decade career performing the "discovered" works of the "last and the least" of the Bach family. Schickele's music combines parodies of musicological scholarship, the conventions of Baroque and Classical music, and slapstick comedy. The name "P. D. Q." is a parody of the three-part names given to some members of the Bach family that are commonly reduced to initials, such as C. P. E. for Carl Philipp Emanuel Bach; PDQ is an initialism for "pretty damned quick".
This gallery of sovereign state flags shows the national or state flags of sovereign states that appear on the list of sovereign states. For flags of other entities, please see gallery of flags of dependent territories. Each flag is depicted as if the flagpole is positioned on the left of the flag, except for those of Iran, Iraq and Saudi Arabia which are depicted with the hoist to the right.
Q is a popular music online magazine. Originally published in print in the UK from 1986 to 2020, it was inactive from 2020 until 2023. In 2023, Q was revived as an online publication. It was founded in 1986 by broadcast journalists Mark Ellen and David Hepworth, who were presenters of the BBC television music series The Old Grey Whistle Test. Q's final printed issue was published in July 2020, but began posting new articles to their website in 2023 before being fully relaunched in 2024.
Kamaal Ibn John Fareed, better known by his stage name Q-Tip, is an American rapper, record producer, singer, and DJ. Nicknamed the Abstract, he is noted for his innovative jazz-influenced style of hip hop production and his philosophical, esoteric and introspective lyrical themes. He embarked on his music career in the late 1980s, as an MC and main producer of the influential alternative hip hop group A Tribe Called Quest. In the mid-1990s, he co-founded the production team The Ummah, followed by the release of his gold-certified solo debut Amplified in 1999. In the following decade, he released the Grammy Award-nominated album The Renaissance (2008) and the experimental album Kamaal the Abstract (2009).
QinetiQ is a multinational defence technology company headquartered in Farnborough, Hampshire. It operates primarily in the defence, security and critical national infrastructure markets and run testing and evaluation capabilities for air, land, sea and target systems.
Avenue Q is a musical comedy featuring puppets and human actors with music and lyrics by Robert Lopez and Jeff Marx and book by Jeff Whitty. It won Best Musical, Book, and Score at the 2004 Tony Awards. The show's format is a parody of Sesame Street, but its content involves adult-oriented themes. It has been praised for its approach to themes of racism, homosexuality and internet pornography.
B&Q Limited is a British multinational DIY and home improvement retailing company, with headquarters in Eastleigh, England. It is a wholly owned subsidiary of Kingfisher plc. It was founded in March 1969 by Richard Block and David Quayle.
QAnon is a far-right American political conspiracy theory and political movement which originated in 2017. QAnon centers on fabricated claims made by an anonymous individual or individuals known as "Q". Those claims have been relayed and developed by online communities and influencers. Their core belief is that a cabal of Satanic, cannibalistic child molesters are operating a global child sex trafficking ring which conspired against Donald Trump. QAnon has direct roots in Pizzagate, an Internet conspiracy theory that appeared one year earlier, but also incorporates elements of many other theories. QAnon has been described as a cult.
Margaret Denise Quigley, professionally known as Maggie Q, is an American actress.
In mathematics, a rational number is a number that can be expressed as the quotient or fraction of two integers, a numerator p and a non-zero denominator q. For example, is a rational number, as is every integer. The set of all rational numbers, also referred to as "the rationals", the field of rationals or the field of rational numbers is usually denoted by boldface Q, or blackboard bold
Quincy Matthew Hanley, better known by his stage name Schoolboy Q, is an American rapper from South Los Angeles, California. Hanley released his debut mixtape, ScHoolboy Turned Hustla (2008) and its sequel, Gangsta & Soul (2009) the following year. After signing with the Carson-based record label Top Dawg Entertainment, Hanley released his debut studio album, Setbacks (2011) and its follow up, Habits & Contradictions (2012) both to positive reception; both also performed moderately on the Billboard 200 chart as digital exclusives.
Channel Q is an LGBT lifestyle talk and EDM top 40 radio network created, owned, and operated by Audacy, Inc. The network airs on the Audacy internet radio service, as well as on Audacy-owned terrestrial radio stations throughout the United States. Channel Q's programming schedule consists of LGBT-centered talk shows, most notably a rebooted version of Loveline, along with Dance/Top 40 music on afternoons, late nights, and weekends.
Android 10 is the tenth major release and the 17th version of the Android mobile operating system. It was first released as a developer preview on March 13, 2019, and was released publicly on September 3, 2019.
Q-Force is a North American adult animated comedy television series created by Gabe Liedman for Netflix. In April 2019, Netflix ordered 10 episodes of the series, with Liedman as a showrunner, along with Sean Hayes, Michael Schur, Todd Milliner and others as executive producers. It was released on September 2, 2021.
