012345I578
1
Name:
T1R123
2012-03-21 6:14
W1H7I5345T5H5R191011
2
Name:
Anonymous
2012-03-22 11:00
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3
Name:
Anonymous
2013-08-31 7:18
We can then extend this to an equality-style relation. Two sets X and Y are said to have the same cardinality if there exists a bijection between X and Y. By the Schroeder-Bernstein theorem, this is equivalent to there being both a one-to-one mapping from X to Y and a one-to-one mapping from Y to X. We then write |X| = |Y|. The cardinal number of X itself is often defined as the least ordinal a with |a| = |X|. This is called the von Neumann cardinal assignment; for this definition to make sense, it must be proved that every set has the same cardinality as some ordinal; this statement is the well-ordering principle. It is however possible to discuss the relative cardinality of sets without explicitly assigning names to objects.
4
Name:
Anonymous
2013-08-31 7:24
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5
Name:
Anonymous
2013-08-31 8:03
The earliest recorded idea of infinity comes from Anaximander, a pre-Socratic Greek philosopher who lived in Miletus. He used the word apeiron which means infinite or limitless.
6
Name:
Anonymous
2013-08-31 8:48
If, on the other hand, the universe were not curved like a sphere but had a flat topology, it could be both unbounded and infinite. The curvature of the universe can be measured through multipole moments in the spectrum of the cosmic background radiation.
7
Name:
Anonymous
2013-08-31 8:49
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r'{ /} ///! ノ /
{ ヽ.,/ _,,.. -''" { { イ /{ヽ
8
Name:
Anonymous
2013-08-31 9:34
An enrichment of ZFC called Internal Set Theory was proposed by Edward Nelson in 1977.
9
Name:
Anonymous
2013-08-31 10:14
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10
Name:
Anonymous
2013-08-31 10:19
In mathematics, the axiom of choice, or AC, is an axiom of set theory equivalent to the statement that "the product of a collection of non-empty sets is non-empty". More explicitly, it states that for every indexed family (S_i)_{i \in I} of nonempty sets there exists an indexed family (x_i)_{i \in I} of elements such that x_i \in S_i for every i \in I.
11
Name:
Anonymous
2013-08-31 11:04
It is possible to prove many theorems using neither the axiom of choice nor its negation; such statements will be true in any model of Zermelo–Fraenkel set theory (ZF), regardless of the truth or falsity of the axiom of choice in that particular model.
12
Name:
Anonymous
2013-08-31 11:39
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く,.ヘ/ヽ.、__ _,,.〈 / ハ. |
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!〈 / T l〈 〉 | |
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〈 、〉 !・ !〉 〉 |
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'-- '´ `''ーr----r‐'´
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13
Name:
Anonymous
2013-08-31 12:48
Formally, the order among cardinal numbers is defined as follows: |X| ≤ |Y| means that there exists an injective function from X to Y. The Cantor–Bernstein–Schroeder theorem states that if |X| ≤ |Y| and |Y| ≤ |X| then |X| = |Y|. The axiom of choice is equivalent to the statement that given two sets X and Y, either |X| ≤ |Y| or |Y| ≤ |X|
14
Name:
Anonymous
2013-08-31 13:12
It took me a while to warm up to it, but I ended up really enjoying the game. I'm pretty mid-level though - can't beat a lot of the songs on extreme, so ymmv.
15
Name:
Anonymous
2013-08-31 13:33
The infinity symbol \infty (sometimes called the lemniscate) is a mathematical symbol representing the concept of infinity. The symbol is encoded in Unicode at U+221E ∞ infinity (HTML: ∞ ∞) and in LaTeX as \infty.
16
Name:
Anonymous
2013-08-31 13:57
Shut the hell up, OP.
17
Name:
Anonymous
2013-08-31 14:19
In languages that do not provide explicit access to such values from the initial state of the program, but do implement the floating point data type, the infinity values might still be accessible and usable as the result of certain operations.
18
Name:
Anonymous
2013-08-31 14:42
Your world is so dangerous! Let me help you.
19
Name:
Anonymous
2013-08-31 15:04
Combinatorial set theory concerns extensions of finite combinatorics to infinite sets. This includes the study of cardinal arithmetic and the study of extensions of Ramsey's theorem such as the Erdős–Rado theorem.
20
Name:
Anonymous
2013-08-31 15:28
細かい作業は出来ないけど、岩をよじ登ってみたり出来るみたいよw
証拠も出さないし、誰も信用していないけどw
21
Name:
Anonymous
2013-08-31 15:50
A choice function is a function f, defined on a collection X of nonempty sets, such that for every set s in X, f(s) is an element of s. With this concept, the axiom can be stated:
22
Name:
Anonymous
2013-08-31 16:35
In constructive set theory, however, Diaconescu's theorem shows that the axiom of choice implies the Law of excluded middle (unlike in Martin-Löf type theory, where it does not). Thus the axiom of choice is not generally available in constructive set theory.
23
Name:
Anonymous
2013-08-31 17:20
Every field extension has a transcendence basis.
24
Name:
Anonymous
2013-08-31 17:24
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_,,.. -:::''"´::::::::::/::::::::::::::::::::::/::::::::::::::::::::::::::::ハ
25
Name:
Anonymous
2013-08-31 18:05
By studying categories and functors, we are not just studying a class of mathematical structures and the morphisms between them; we are studying the relationships between various classes of mathematical structures. This is a fundamental idea, which first surfaced in algebraic topology.
26
Name:
Anonymous
2013-08-31 18:49
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', \ ハ ゝ゚` ノ / ,ハ ∧ '、
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; |/ /_ } ; }
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r'{ /} ///! ノ /
{ ヽ.,/ _,,.. -''" { { イ /{ヽ
27
Name:
Anonymous
2013-08-31 18:50
Stanislaw Ulam, and some writing on his behalf, have claimed that related ideas were current in the late 1930s in Poland. Eilenberg was Polish, and studied mathematics in Poland in the 1930s. Category theory is also, in some sense, a continuation of the work of Emmy Noether (one of Mac Lane's teachers) in formalizing abstract processes; Noether realized that in order to understand a type of mathematical structure, one needs to understand the processes preserving that structure. In order to achieve this understanding, Eilenberg and Mac Lane proposed an axiomatic formalization of the relation between structures and the processes preserving them.
28
Name:
Anonymous
2013-08-31 20:04
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/:::::/:::::::// _,,.. -─- 、., 三 そんな馬鹿な…
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.ト、_,ノ \:;>''"´ / , ` ヽ. Ξ 流し斬りが
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\ / ,:' / ; |! { | _.」_イ ハ '; ; 三 完全に入ったのに…
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、 \」lハlリ, xx|_/ || |
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`'' ー ''"´ ,.く:::::::::::::::::::::::::/=ヽ-ヘァ'",>ー‐'´ { '、
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29
Name:
Anonymous
2013-08-31 21:30
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;' {/ ゙' ー ''"リ _r;' _-、_) /
r'{ /} ///! ノ /
{ ヽ.,/ _,,.. -''" { { イ /{ヽ
30
Name:
Anonymous
2013-08-31 22:56
__,.r 、,.-、_ ⊂[[二ニニ=-
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31
Name:
Anonymous
2013-09-01 0:21
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32
Name:
Anonymous
2013-09-01 1:46
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33
Name:
Anonymous
2013-09-01 3:11
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