To almost two generations of Americans it must have seemed as though the existence of Mr. Sam coincided with that of the House.

Since the 1950s, this type of fiction has to a large extent merged with science fictional tropes involving cross-time travel between alternate histories or psychic awareness of the existence of " our " universe by the people in another ; or ordinary voyaging uptime ( into the past ) or downtime ( into the future ) that results in history splitting into two or more time-lines.

Because Ambrosius and Vortigern are shown in the Historia Brittonum as being in conflict, some historians have suspected that this preserves a historical core of the existence of two parties in opposition to one another, one headed by Ambrosius and the other by Vortigern.

The most striking feature is the existence of two great lines of depression, due largely to the subsidence of whole segments of the Earth's crust, the lowest parts of which are occupied by vast lakes.

Historians are divided on the detail of Ælle's life and existence as it was during the least-documented period in English history of the last two millennia.

During its final two years of existence, the AFL teams won upset victories over the NFL teams in Super Bowl III and IV, the former New York Jets victory was considered one of the biggest upsets in American sports history.

Being is quite conceivable apart from actual existence ; so much so that the very first and the most universal of all the distinctions in the realm of being is that which divides it into two classes, that of the real and that of the possible.

The hypothesis was inspired by the existence of the ancient Kingdom of Iberia farther east in the Mediterranean and further by some typological similarities between the two languages.

In 1919, after delays caused by the destruction of World War I and a lengthy debate over who should head the institution and the socio-economic meanings of a reconciliation of the fine arts and the applied arts ( an issue which remained a defining one throughout the school's existence ), Gropius was made the director of a new institution integrating the two called the Bauhaus.

The later tradition of commentary also recognizes the existence of two additional types of bodhisattas: the paccekabodhisatta who will attain Paccekabuddhahood, and the savakabodhisatta who will attain enlightenment as a disciple of a Buddha.

The only clues for its possible existence are Persian inscriptions that refer to two places called " Saparda ": one area in Media and another in Asia Minor, debated to be Sardis.

In the strips, it is expressed that the two towns are rivals with each other and before The Dandy did a drastic format change they had an embassy in Beanotown which many of the town's citizens attempted to overrun, but failed ( the embassy had no existence in The Beano ).

The large coal deposits of the Carboniferous primarily owe their existence to two factors.

Archaeological findings providing evidence for the existence of the Shang Dynasty, c. 1600 – 1046 BC, are divided into two sets.

The Citadelle of Quebec still survives as the largest citadel still in official military operation in North America after more than two hundred years of existence.

Dutch physicists Hendrik B. G. Casimir and Dirk Polder at Philips Research Labs proposed the existence of a force between two polarizable atoms and between such an atom and a conducting plate in 1947, and, after a conversation with Niels Bohr who suggested it had something to do with zero-point energy, Casimir alone formulated the theory predicting a force between neutral conducting plates in 1948 ; the former is called the Casimir-Polder force while the latter is the Casimir effect in the narrow sense.

So assume ƒ is differentiable at 0, as a function of two real variables from Ω to C. This is equivalent to the existence of two complex numbers and ( which are the partial derivatives of ƒ ) such that we have the linear approximation

Since the reunions in the UK and Australia in 1957, two generations of Christadelphians have grown up with little awareness of the existence of the minority " fellowships ", or awareness that the main group is called " Central " by the minority groups.

Dvaita Vedanta ( dualistic conclusions of the Vedas ) school of Indian philosophy espouses dualism by theorizing the existence of two separate realities.

Three living species of elephant are recognized: the African bush elephant, the African forest elephant and the Indian or Asian elephant ; although some group the two African species into one and some researchers also postulate the existence of a fourth species in West Africa.

If neither A nor B includes the idea of existence, then " some A are B " simply adjoins A to B. Conversely, if A or B do include the idea of existence in the way that " triangle " contains the idea " three angles equal to two right angles ", then " A exists " is automatically true, and we have an ontological proof of A's existence.

According to the " two sense " view of existence, which derives from Alexius Meinong, existential statements fall into two classes.

After Montag starts to rip a few pages from the beginning of a rare copy of The New Testament ( one of the few left that actually contains God's word, rather than the bastardized versions that have Jesus and other Biblical characters shilling products ), Faber relents and teaches Montag about the importance of literature in its attempt to explain human existence.

Characteristic is the 90 ° rotational symmetry and chirality, hence the absence of reflectional symmetry, and the existence of two versions of swastikas that are each other's mirror image.

Any discussion of the sources of Titus Andronicus is complicated by the existence of two other versions of the story ; a prose history and a ballad ( both of which are anonymous and undated ).

Weak versions of behaviorism in psychology, which admit for the existence of mental phenomena, but not to their meaningful study as causes of any observable behavior in psychology, view mental phenomena as either epiphenomena, or linguistic summaries, as instrumentalist tools for examination of objectively observable physical behavior in others.

Following Crisis on Infinite Earths, which rebooted the history of the DC Universe and retro-actively eliminated the existence of the Golden and Silver Age versions of Krypton, writer / artist John Byrne was given the task of recreating the entire Superman mythos.

There are many 19th century versions of the book still in existence.

In fact, a version of the book edited by Torres Rodríguez was used in compiling this article, although there are many equally valid versions in existence, both in Castilian Spanish and in other languages.

Philologists such as Ramón Menéndez Pidal worked with him to collect versions from the south, many in existence since the Middle Ages.

There are versions of this story involving both Norbert Wiener and Edmund Landau, who, it is claimed, " so doubted the existence of Littlewood that he made a special trip to Great Britain to see the man with his own eyes ".< ref >

Geoff Johns stated that the intent of the mini-series was to validate the existence of all three versions of the team while simultaneously restoring the pre-Crisis Legion's continuity as well.

Some versions of the Langlands conjectures are vague, or depend on objects such as the Langlands groups, whose existence in unproven, or on the L-group that has several inequivalent definitions.

The situation is made complicated due to the existence of several Chinese character encoding systems in use, the most common ones being: Unicode, Big5, and Guobiao, the latter of which has several versions.

Cowan no longer supports the existence of two tiers but claims the only thing now known about the Yellow and Turquoise systems is that they are more complex versions of Orange and Green.

He initially adopted Biblical literalism, though while at normal school he was exposed to more liberal versions of Christianity that taught the existence of internal inconsistencies in the Bible ; for several years he adopted the approach of a Bible teacher who counselled him to " treat Bible as [...] a nice plate of fish " and " eat the meat and leave the bones for the dogs.

He sought to erase the Acclaim Universe from existence, but was opposed by the Seleski twins, alternate versions of himself.

Most New Zealanders consider the Treaty of Waitangi as the founding document of the nation of New Zealand, with formal sovereignty vested in the British Crown ( the Crown in Right of New Zealand from 1947 ), but the existence of different versions of the Treaty, in both Māori and English, and its brevity, leave this subject to arguments over the preferred interpretation.

This group continued to claim to be the WRP, and for a time two versions of the group were in existence, each publishing their own daily News Line paper.

* During the chronal disruptions of Zero Hour, multiple versions of Hawkman ( and Hawkgirl / Hawkwoman ) from alternate timelines were appearing in and out of existence.

Only three known versions of the Pond — Moonlight are still in existence and, as a result of the hand-layering of the gums, each is unique.

* Versioning file system, a file system which provides for the concurrent existence of several versions of a file

Several versions of the game have been in existence since the late 1960s, whilst the game in its present form began to take shape in the late 1970s and early 1980s.

The 2007 – 2008 weekly series Countdown to Final Crisis and its spin-offs would either directly show or insinuate the existence of alternate versions of Booster Gold in the Multiverse.

As of yet, there is no evidence for the existence of a multiverse, but some versions of the theory do make predictions that some researchers studying M-theory and gravity leaks hope to see some evidence of soon.

Further solutions to the existence of God have been proposed by St. Anselm, who formulated the first ontological argument ; Ibn Rushd ( Averroes ) and Aquinas, who presented their own versions of the cosmological argument ( the kalam argument and the first way ), respectively ; Descartes, who said that the existence of a benevolent God was logically necessary for the evidence of the senses to be meaningful ; and Immanuel Kant, who argued that the existence of God can be deduced from the existence of good.