3077: de Sitter - Revision history

90.129.215.32: Changed it to account for zombies.

2025-10-17T10:21:45Z

Changed it to account for zombies.

FaviFake: Yay

2025-04-24T15:03:28Z

Yay

108.162.237.160: Removed the incomplete tag: I am a normie and understood the explanation.

2025-04-23T13:53:40Z

Removed the incomplete tag: I am a normie and understood the explanation.

Kurahaupo: /* Explanation */ remove duplicate reference to {{w:Triangle}}. Add note about de Sitter dying in 1934, making the prohibition pointless.

2025-04-23T10:04:32Z

‎Explanation: remove duplicate reference to {{w:Triangle}}. Add note about de Sitter dying in 1934, making the prohibition pointless.

Kurahaupo: /* Explanation */

2025-04-23T09:58:35Z

‎Explanation

172.69.70.150: Transcript seems complete.

2025-04-19T02:53:26Z

Transcript seems complete.

172.68.205.135: /* Explanation */

2025-04-18T19:27:42Z

‎Explanation

172.69.135.13: /* Explanation */ correspondence link to wiktionary

2025-04-18T15:40:31Z

‎Explanation: correspondence link to wiktionary

172.69.135.13: /* Explanation */ clarify sphere

2025-04-18T15:35:16Z

‎Explanation: clarify sphere

172.69.135.14: /* Explanation */ correspondence

2025-04-18T15:32:47Z

‎Explanation: correspondence

@@ Line 18: / Line 18: @@
 In contrast, an {{w|anti-de Sitter space}} is a space that has constant negative (hyperbolic) spatial curvature, where the sum of the internal angles of any triangle is less than 180°, and two parallel lines will diverge when extended. An anti-de Sitter space is a theoretical space with strange curves and extra dimensions which is used in studying the space-time structure of the universe.
-The caption "My house is an anti-de Sitter space" refers instead to being against the actual physicist {{w|Willem de Sitter}}, after whom both spatial geometries are named, because the speaker forbids de Sitter from entering their house. This prohibition is pointless since he died in 1934.
+The caption "My house is an anti-de Sitter space" refers instead to being against the actual physicist {{w|Willem de Sitter}}, after whom both spatial geometries are named, because the speaker forbids de Sitter from entering their house. This prohibition is pointless since he died in 1934, unless this is something like [[599: Apocalypse]] and he doesn't want de Sitter's zombie to enter.
 The title text refers to {{w|conformal field theory}}, a set of rules for how tiny particles behave on boundaries. The ideas of conformal field theory and anti-de Sitter space are closely linked: everything in an anti-de Sitter space has a parallel in conformal field theory, a property which is usually called the anti-de Sitter space/conformal field theory correspondence or {{w|AdS/CFT correspondence}} for short. The extra pun here is "{{wiktionary|correspondence}}" also meaning "mutual communication or discourse", typically communication by letter or email.

@@ Line 20: / Line 20: @@
 The caption "My house is an anti-de Sitter space" refers instead to being against the actual physicist {{w|Willem de Sitter}}, after whom both spatial geometries are named, because the speaker forbids de Sitter from entering their house. This prohibition is pointless since he died in 1934.
-The title text refers to {{w|conformal field theory}}, a set of rules for how tiny particles behave on boundaries. The ideas of conformal field theory and anti-de Sitter space are closely linked: everything in an anti-de Sitter space has a parallel in conformal field theory, a property which is usually called the anti-de Sitter space/conformal field theory correspondence or {{w|AdS/CFT correspondence}} for short.
+The title text refers to {{w|conformal field theory}}, a set of rules for how tiny particles behave on boundaries. The ideas of conformal field theory and anti-de Sitter space are closely linked: everything in an anti-de Sitter space has a parallel in conformal field theory, a property which is usually called the anti-de Sitter space/conformal field theory correspondence or {{w|AdS/CFT correspondence}} for short. The extra pun here is "{{wiktionary|correspondence}}" also meaning "mutual communication or discourse", typically communication by letter or email.
 ==Transcript==

@@ Line 10: / Line 10: @@
 ==Explanation==
 This comic is a pun on two uses of the term "space":
 * in the everyday sense as a place for a person or thing to exist in; and

@@ Line 17: / Line 17: @@
 Willem de Sitter was a notable Dutch mathematician and physicist in the late 19th and early 20th centuries, known for his work using topological models to describe the overall structure of the universe. He is best known for formulating the definition of a {{w|de Sitter space}}, which has constant positive (elliptic) curvature, where the sum of the internal angles of any {{w|Triangle#Triangle in non-planar space|triangle}} is more than 180°, and lines that initially appear parallel will always meet; the surface of a sphere is an example of a two-dimensional de Sitter space.
-In contrast, an {{w|anti-de Sitter space}} is a space that has constant negative (hyperbolic) spatial curvature, where the sum of the internal angles of any {{w|Triangle#Triangle in non-planar space|triangle}} is less than 180°, and two parallel lines will diverge when extended. An anti-de Sitter space is a theoretical space with strange curves and extra dimensions which is used in studying the space-time structure of the universe.
+In contrast, an {{w|anti-de Sitter space}} is a space that has constant negative (hyperbolic) spatial curvature, where the sum of the internal angles of any triangle is less than 180°, and two parallel lines will diverge when extended. An anti-de Sitter space is a theoretical space with strange curves and extra dimensions which is used in studying the space-time structure of the universe.
-The caption "My house is an anti-de Sitter space" refers instead to being against the actual physicist {{w|Willem de Sitter}}, after whom both spatial geometries are named, because the speaker forbids de Sitter from entering their house.
+The caption "My house is an anti-de Sitter space" refers instead to being against the actual physicist {{w|Willem de Sitter}}, after whom both spatial geometries are named, because the speaker forbids de Sitter from entering their house. This prohibition is pointless since he died in 1934.
 The title text refers to {{w|conformal field theory}}, a set of rules for how tiny particles behave on boundaries. The ideas of conformal field theory and anti-de Sitter space are closely linked: everything in an anti-de Sitter space has a parallel in conformal field theory, a property which is usually called the anti-de Sitter space/conformal field theory correspondence or {{w|AdS/CFT correspondence}} for short.

@@ Line 10: / Line 10: @@
 ==Explanation==
-{{incomplete|The explanation is too technical and hard for understand for normies.}}
+{{incomplete|The explanation is too technical and hard for understand for normies. EDIT: I think I've fixed it. If you're not a math boffin but can still understand this page then please edit it and remove this tag.}}
-An {{w|anti-de Sitter space}} (AdS) is a space which has constant negative (hyperbolic) spatial curvature, in which the sum of the internal angles of {{w|Triangle#Triangle in non-planar space|triangles}} is less than 180° and two parallel lines will diverge when extended. AdS is a theoretical space with strange curves and extra dimensions which is used in studying the space-time structure of the universe. This is in contrast to a {{w|de Sitter space}}, which has constant positive (elliptic) curvature, the sum of a triangle's angles is more than 180°, and lines that initially appear parallel will always meet; the surface of a sphere is an example of a two-dimensional de Sitter space. The caption "My house is an anti-de Sitter space" refers instead to being against the actual physicist {{w|Willem de Sitter}}, after whom both spatial geometries are named, because the speaker forbids de Sitter from entering their house.
+This comic is a pun on two uses of the term "space":
-The title text refers to {{w|conformal field theory}} (CFT), a set of rules for how tiny particles behave on boundaries. The ideas of CFT and AdS are closely linked: everything in an AdS has a parallel in CFT, a property which is usually called the {{w|AdS/CFT correspondence}}. The extra pun here is "{{wiktionary|correspondence}}" also meaning "mutual communication or discourse", typically communication by letter or email.
+Willem de Sitter was a notable Dutch mathematician and physicist in the late 19th and early 20th centuries, known for his work using topological models to describe the overall structure of the universe. He is best known for formulating the definition of a {{w|de Sitter space}}, which has constant positive (elliptic) curvature, where the sum of the internal angles of any {{w|Triangle#Triangle in non-planar space|triangle}} is more than 180°, and lines that initially appear parallel will always meet; the surface of a sphere is an example of a two-dimensional de Sitter space.
 ==Transcript==

@@ Line 16: / Line 16: @@
 ==Transcript==
-{{incomplete transcript|Do NOT delete this tag too soon.}}
 :[A large note is taped to a closed door, which has a doorknob with a keyhole on it. The note reads:]
 :20th century Dutch physicist Willem de Sitter is '''''not''''' welcome here

@@ Line 13: / Line 13: @@
 An {{w|anti-de Sitter space}} (AdS) is a space which has constant negative (hyperbolic) spatial curvature, in which the sum of the internal angles of [https://en.wikipedia.org/wiki/Triangle#Triangle_in_non-planar_space triangles] is less than 180° and two parallel lines will diverge when extended. AdS is a theoretical space with strange curves and extra dimensions which is used in studying the space-time structure of the universe. This is in contrast to a {{w|de Sitter space}}, which has constant positive (elliptic) curvature, the sum of a triangle's angles is more than 180°, and lines that initially appear parallel will always meet; the surface of a sphere is an example of a two-dimensional de Sitter space. The caption "My house is an anti-de Sitter space" refers instead to being against the actual physicist {{w|Willem de Sitter}}, after whom both spatial geometries are named, because the speaker forbids de Sitter from entering their house.
-The title text refers to {{w|conformal field theory}} (CFT), a set of rules for how tiny particles behave on boundaries. The ideas of CFT and AdS are closely linked: everything in an AdS has a parallel in CFT, a property which is usually called the {{w|AdS/CFT correspondence}}. The extra pun here is "correspondence" also meaning "mutual communication or discourse", typically communication by letter or email.
+The title text refers to {{w|conformal field theory}} (CFT), a set of rules for how tiny particles behave on boundaries. The ideas of CFT and AdS are closely linked: everything in an AdS has a parallel in CFT, a property which is usually called the {{w|AdS/CFT correspondence}}. The extra pun here is "[https://en.wiktionary.org/wiki/correspondence correspondence]" also meaning "mutual communication or discourse", typically communication by letter or email.
 ==Transcript==