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Ontological Paradox
A temporal paradox, time paradox, or time travel paradox, is a paradox, an apparent contradiction, or logical contradiction associated with the idea of time travel or other foreknowledge of the future. While the notion of time travel to the future complies with the current understanding of physics via relativistic time dilation, temporal paradoxes arise from circumstances involving hypothetical time travel to the past – and are often used to demonstrate its impossibility. Types Temporal paradoxes fall into three broad groups: bootstrap paradoxes, consistency paradoxes, and Newcomb's paradox. Bootstrap paradoxes violate causality by allowing future events to influence the past and cause themselves, or "bootstrapping", which derives from the idiom "." Consistency paradoxes, on the other hand, are those where future events influence the past to cause an apparent contradiction, exemplified by the grandfather paradox, where a person travels to the past to prevent the conception of o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paradox
A paradox is a logically self-contradictory statement or a statement that runs contrary to one's expectation. It is a statement that, despite apparently valid reasoning from true or apparently true premises, leads to a seemingly self-contradictory or a logically unacceptable conclusion. A paradox usually involves contradictory-yet-interrelated elements that exist simultaneously and persist over time. They result in "persistent contradiction between interdependent elements" leading to a lasting "unity of opposites". In logic, many paradoxes exist that are known to be invalid arguments, yet are nevertheless valuable in promoting critical thinking, while other paradoxes have revealed errors in definitions that were assumed to be rigorous, and have caused axioms of mathematics and logic to be re-examined. One example is Russell's paradox, which questions whether a "list of all lists that do not contain themselves" would include itself and showed that attempts to found set theory on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Somewhere In Time (film)
''Somewhere in Time'' is a 1980 American romantic fantasy drama film from Universal Pictures, directed by Jeannot Szwarc and starring Christopher Reeve, Jane Seymour and Christopher Plummer. It is a film adaptation of the novel '' Bid Time Return'' (1975) by Richard Matheson, who also wrote the screenplay. Reeve plays Richard Collier, a playwright who becomes obsessed with the photograph of a young woman at the Grand Hotel on Mackinac Island, Michigan. Through self-hypnosis, he transports himself back in time to the year 1912 to find love with actress Elise McKenna (portrayed by Seymour). He comes into conflict with Elise's manager, William Fawcett Robinson (portrayed by Plummer), who attempts to deter him, fearing that romance would derail her career. The film is known for its musical score composed by John Barry, featuring pianist Roger Williams. The 18th variation of Sergei Rachmaninoff's '' Rhapsody on a Theme of Paganini'' is also used several times. In 2018, Seymour di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Expected Utility Hypothesis
The expected utility hypothesis is a foundational assumption in mathematical economics concerning decision making under uncertainty. It postulates that rational agents maximize utility, meaning the subjective desirability of their actions. Rational choice theory, a cornerstone of microeconomics, builds this postulate to model aggregate social behaviour. The expected utility hypothesis states an agent chooses between risky prospects by comparing expected utility values (i.e., the weighted sum of adding the respective utility values of payoffs multiplied by their probabilities). The summarised formula for expected utility is U(p)=\sum u(x_k)p_k where p_k is the probability that outcome indexed by k with payoff x_k is realized, and function ''u'' expresses the utility of each respective payoff. Graphically the curvature of the u function captures the agent's risk attitude. For example, imagine you’re offered a choice between receiving $50 for sure, or flipping a coin to win $100 i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thought Experiment
A thought experiment is an imaginary scenario that is meant to elucidate or test an argument or theory. It is often an experiment that would be hard, impossible, or unethical to actually perform. It can also be an abstract hypothetical that is meant to test our intuitions about morality or other fundamental philosophical questions. History The ancient Greek , "was the most ancient pattern of mathematical proof", and existed before Euclidean geometry, Euclidean mathematics, where the emphasis was on the conceptual, rather than on the experimental part of a thought experiment. Johann Witt-Hansen established that Hans Christian Ørsted was the first to use the equivalent German term . Ørsted was also the first to use the equivalent term in 1820. By 1883, Ernst Mach used in a different sense, to denote exclusively the conduct of a experiment that would be subsequently performed as a by his students. Physical and mental experimentation could then be contrasted: Mach asked hi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holocaust
The Holocaust (), known in Hebrew language, Hebrew as the (), was the genocide of History of the Jews in Europe, European Jews during World War II. From 1941 to 1945, Nazi Germany and Collaboration with Nazi Germany and Fascist Italy, its collaborators systematically murdered some six million Jews across German-occupied Europe, around two-thirds of Europe's Jewish population. The murders were carried out primarily through mass shootings and poison gas in extermination camps, chiefly Auschwitz concentration camp#Auschwitz II-Birkenau, Auschwitz-Birkenau, Treblinka extermination camp, Treblinka, Belzec extermination camp, Belzec, Sobibor extermination camp, Sobibor, and Chełmno extermination camp, Chełmno in Occupation of Poland (1939–1945), occupied Poland. Separate Nazi persecutions killed a similar or larger number of non-Jewish civilians and prisoners of war (POWs); the term ''Holocaust'' is sometimes used to include the murder and persecution of Victims of Nazi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
World War II
World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the world's countries participated, with many nations mobilising all resources in pursuit of total war. Tanks in World War II, Tanks and Air warfare of World War II, aircraft played major roles, enabling the strategic bombing of cities and delivery of the Atomic bombings of Hiroshima and Nagasaki, first and only nuclear weapons ever used in war. World War II is the List of wars by death toll, deadliest conflict in history, causing World War II casualties, the death of 70 to 85 million people, more than half of whom were civilians. Millions died in genocides, including the Holocaust, and by massacres, starvation, and disease. After the Allied victory, Allied-occupied Germany, Germany, Allied-occupied Austria, Austria, Occupation of Japan, Japan, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adolf Hitler
Adolf Hitler (20 April 1889 – 30 April 1945) was an Austrian-born German politician who was the dictator of Nazi Germany from 1933 until Death of Adolf Hitler, his suicide in 1945. Adolf Hitler's rise to power, He rose to power as the leader of the Nazi Party, becoming Chancellor of Germany#Nazi Germany (1933–1945), the chancellor in 1933 and then taking the title of in 1934. His invasion of Poland on 1 September 1939 marked the start of the Second World War. He was closely involved in military operations throughout the war and was central to the perpetration of the Holocaust: the genocide of Holocaust victims, about six million Jews and millions of other victims. Hitler was born in Braunau am Inn in Austria-Hungary and moved to German Empire, Germany in 1913. He was decorated during his service in the German Army in the First World War, receiving the Iron Cross. In 1919 he joined the German Workers' Party (DAP), the precursor of the Nazi Party, and in 1921 was app ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amazing Stories
''Amazing Stories'' is an American science fiction magazine launched in April 1926 by Hugo Gernsback's Experimenter Publishing. It was the first magazine devoted solely to science fiction. Science fiction stories had made regular appearances in other magazines, including some published by Gernsback, but ''Amazing'' helped define and launch a new genre of pulp fiction. ''Amazing'' has been published, with some interruptions, for 98 years, going through a half-dozen owners and many editors as it struggled to be profitable. Gernsback was forced into bankruptcy and lost control of the magazine in 1929. In 1938 it was purchased by Ziff-Davis, which hired Raymond A. Palmer as editor. Palmer made the magazine successful though it was not regarded as a quality magazine within the science fiction community. In the late 1940s ''Amazing'' presented as fact stories about the Shaver Mystery, a lurid mythos that explained accidents and disaster as the work of robots named deros, whic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Novikov Self-consistency Principle
The Novikov self-consistency principle, also known as the Novikov self-consistency conjecture and Larry Niven's law of conservation of history, is a principle developed by Russian physicist Igor Dmitriyevich Novikov in the mid-1980s. Novikov intended it to solve the problem of paradoxes in time travel, which is theoretically permitted in certain solutions of general relativity that contain what are known as closed timelike curves. The principle asserts that if an event exists that would cause a paradox or any "change" to the past whatsoever, then the probability of that event is zero. It would thus be impossible to create time paradoxes. History Physicists have long known that some solutions to the theory of general relativity contain closed timelike curves—for example the Gödel metric. Novikov discussed the possibility of closed timelike curves (CTCs) in books he wrote in 1975 and 1983, offering the opinion that only self-consistent trips back in time would be permitt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Father's Day (Doctor Who)
"Father's Day" is the eighth episode of the Doctor Who (series 1), first series of the British science fiction on television, science fiction television programme ''Doctor Who'', first broadcast on 14 May 2005 on BBC One. It was written by Paul Cornell and directed by Joe Ahearne. In this episode, alien time traveller Ninth Doctor, the Doctor (Christopher Eccleston) agrees to take his Companion (Doctor Who), companion Rose Tyler (Billie Piper) back to the day her father Pete Tyler, Pete (Shaun Dingwall) died in 1987. When Rose intervenes and pulls her father out of the path of a car, time is wounded and dangerous Reapers attack, threatening to erase history. Pete eventually realises that to get rid of the Reapers, he must throw himself under the car that was originally meant to kill him. Lead writer and executive producer Russell T Davies conceived "Father's Day" as an emotionally driven time travel story to explore Rose's character. He chose Cornell to write the episode; Cornel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Doctor Who
''Doctor Who'' is a British science fiction television series broadcast by the BBC since 1963. The series, created by Sydney Newman, C. E. Webber and Donald Wilson (writer and producer), Donald Wilson, depicts the adventures of an extraterrestrial being called the Doctor, part of a humanoid species called Time Lords. The Doctor travels in the universe and in time using a time travelling Spacecraft, spaceship called the TARDIS, which externally appears as a British police box. While travelling, the Doctor works to save lives and liberate oppressed peoples by combating List of Doctor Who villains, foes. The Doctor usually travels with Companion (Doctor Who), companions. Beginning with William Hartnell, List of actors who have played the Doctor, fourteen actors have headlined the series as the Doctor; the most recent being Ncuti Gatwa, who portrayed the Fifteenth Doctor from 2023 to 2025. The transition between actors is written into the plot of the series with the Regeneration ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Star Trek Materials
This is a list of notable fictional materials from the science fiction universe of ''Star Trek''. Like other aspects of stories in the franchise, some were recurring plot elements from one episode or series to another. Metals for starship construction The fictional metals duranium and tritanium were referred to in many episodes as extremely hard alloys used in starship hulls and hand-held tools. The planet-killer in " The Doomsday Machine" had a hull made of solid neutronium, which is capable of withstanding a starship's phasers. Neutronium is considered to be virtually indestructible; the only known way of stopping the planet-killer is to destroy it from the inside via the explosion of a starship's impulse engines. Federation ships in the 32nd century also used this material in their construction. The NX-01 Enterprise partly consists of horonium, an element that is rare to find but can be synthesised. It is also used to power a time portal on Krulmuth-B. Transparent aluminum ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
