ã¨ã³ãã¨ã³ã¨ã³ãã¯ããã®ååããå対ãªãã ããã¨ã¯èª°ã§ãæãã§ããããããããå®ç¾©ã®ä»æ¹ã«ãã£ã¦ã¯å対æ§ãè¦ãã«ãããã¨ãããã¾ãããã®è¨äºã§ã¯ãã¨ã³ãã¨ã³ã¨ã³ãã®å対æ§ãåºæ¥ãã ãè¦ãããããªããããªå®ç¾©ã¨è¨æ³ãæ示ãã¾ãã$`\newcommand{\END}{ \overline{\prod} }
\newcommand{\COEND}{ \underline{\sum} }
\newcommand{\LEFT}{ \overline{L} }
\newcommand{\RIGHT}{ \overline{R} }
\newcommand{\COLEFT}{ \underline{L} }
\newcommand{\CORIGHT}{ \underline{R} }
\newcommand{\cat}[1]{ \mathcal{#1} }
\newcommand{\mbf}[1]{ \mathbf{#1} }
\newcommand{\mrm}[1]{ \mathrm{#1} }
\newcommand{\o}[1]{ \overline{#1} }
\newcommand{\id}{ \mathrm{id} }
\newcommand{\In}{ \text{ in }}
\newcommand{\On}{ \text{ on }}
\newcommand{\op}{ \mathrm{op}}
`$
å 容ï¼
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- ã¨ã³ãï¼ $`{\displaystyle \int_{x\in |\cat{C|}} }`$
- ã³ã¨ã³ãï¼ $`{\displaystyle \int^{x\in |\cat{C|}} }`$
ä¸è¨éå»è¨äºã®æåã®3ã¤ã®è¨äºã§ã¯ã次ã®è¨æ³ã使ã£ã¦ãã¾ãã
- ã¨ã³ãï¼ $`{\displaystyle \END_{\,x\in |\cat{C|}} }`$
- ã³ã¨ã³ãï¼ $`{\displaystyle \COEND^{\,x\in |\cat{C|}} }`$
ç·ç©è¨å·ããã¤è¨å·ãã¨ç·åè¨å·ãã·ã°ãè¨å·ãã使ã£ã¦ããã®ã¯ãã¨ã³ãã¯éåã®ç·ç´ç©ã®é¨åéåãã³ã¨ã³ãã¯éåã®ç·ç´åã®åéåã«ãªãããã§ãã
$`\quad {\displaystyle \END_{\,x\in |\cat{C|}} P(x, x) \subseteq \prod_{x\in |\cat{C}| } P(x, x) }\\
\quad {\displaystyle \COEND^{\,x\in |\cat{C|}} P(x, x) = \left(\sum_{x\in |\cat{C|}} P(x, x) \right)/\simeq
}`$
ãªã¼ãã¼ã©ã¤ã³ï¼ã¢ã³ãã¼ã©ã¤ã³ãä¸ç·ï¼ä¸ç·ãããªããã¤è¨å·ï¼ã·ã°ãè¨å·ã¯ãéåéã®ç·ç´ç©ã¨ç·ç´åã§ãã$`\simeq`$ ã¯ã¨ããåå¤é¢ä¿ã§ãã
ã¨ã³ãï¼ã³ã¨ã³ããå®ç¾©ããéã¯ãå $`\cat{C}`$ ã¯å°ããåã¨ä»®å®ãã¦ãã*1ã®ã§ã$`|\cat{C}|`$ ã¯åãªãæ®éã®éåã§ãããããã£ã¦ãéå $`|\cat{C}|`$ ã§ã¤ã³ããã¯ã¹ä»ããããéåæã®ç·ç´ç©ã¨ç·ç´åãåãªãæ®éã®éåã§ããã¨ã³ãã¯æ®éã®éåã®é¨åéåãã³ã¨ã³ãã¯æ®éã®éåã®åéåã§ãã
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ããã§ãããã2ã¤ã®æ¦å¿µãå対ã£ã½ãè¦ãããããªè¨æ³ãç´æãã¾ãããã
$`l, r:X \to Y \In \mbf{Set}`$ ãããã¨ãã$`l = r`$ ã¯éå $`X`$ ä¸ã®æ¹ç¨å¼ãequationãã§ãããã®è§£ç©ºéãsolution spaceãã¯æ¬¡ã®ããã§ãã
$`\quad \{x\in X \mid l(x) = r(x) \}`$
$`I`$ ãã¤ã³ããã¯ã¹éåãindexing set | ã¤ã³ããã·ã³ã°éåãã¨ãã¦ãã¤ã³ããã¯ã¹ä»ããããæ¹ç¨å¼ã®æãindexed family of equationsããèãã¾ããããã¯æ¬¡ã®ããã«æ¸ãã¾ãã
$`\quad \left( l_i = r_i \On X \right)_{i \in I} \\
\text{Where } l_i, r_i : X \to Y_i \In \mbf{Set}
`$
ãããé£ç«æ¹ç¨å¼ç³»ãsystem of equationsãã¨å¼ã³ã¾ããé£ç«æ¹ç¨å¼ç³»ã®è§£ç©ºéã¯æ¬¡ã®ããã«æ¸ããã¨ã«ãã¾ãã
$`\quad \left\langle l_i = r_i \On X \right\rangle_{i\in I}\\
:= \{ x\in X \mid \forall i\in I.\, l_i(x) = r_i(x) \}
`$
次ã«ããã観ç¹ããã¯é£ç«æ¹ç¨å¼ç³»ã®å対ã§ããé¢ä¿æãå®ç¾©ãã¾ããéå $`X`$ ä¸ã®é¢ä¿æãfamily of relationsãã¨ã¯ãã¤ã³ããã¯ã¹ä»ããããé¢ä¿ã®æãindexed family of relationsãã§ãã
$`\quad \left( R_i \On X \right)_{i \in I}\\
\text{Where } R_i \subseteq X \times X
`$
é¢ä¿æãããã¨ããããã $`X`$ ä¸ã®åå¤é¢ä¿ãå®ç¾©ã§ãã¾ãã次ã®æé ã§ãã
- ãã¹ã¦ã®é¢ä¿éã®åä½µ $`\widetilde{R} := {\displaystyle \bigcup_{i\in I}R_i}`$ ãä½ãã
- é¢ä¿ $`\widetilde{R}\subseteq X\times X`$ ã®åå°ç対称çæ¨ç§»çéå ãreflexive-symmetric-transitive closureããä½ãã
ãããã¦ä½ã£ãåå¤é¢ä¿ããé¢ä¿æã®åå¤éå ãequivalence closureãã¨å¼ã¶ãã¨ã«ãã¾ããå®ç¾©ããåå¤éå ã¯ãé¢ä¿æã®ãã¹ã¦ã®é¢ä¿ãå«ãæå°ã®åå¤é¢ä¿ã§ãã
é¢ä¿æ $`\left( R_i \On X \right)_{i \in I}`$ ã«å¯¾ãã¦ããã®åå¤éå ã«ããåéåã次ã®ããã«æ¸ããã¨ã«ãã¾ãã
$`\quad \left[ R_i \On X \right]^{i\in I}`$
山形æ¬å¼§ã¨è§æ¬å¼§ãä¸ä»ãã¨ä¸ä»ãã«ãã£ã¦å対ã£ã½ãæããåºãã¦ãã¾ããå対ã«æãããï¼è¦ãããã¯ãæ £ãã®åé¡ãããã®ã§ãæ £ããããããã«ããã£ã½ãè¨æ³ã«ãã¾ãããé£ç«æ¹ç¨å¼ç³»ã¨é¢ä¿æãããã¦è§£ç©ºéï¼é¨åéåï¼ã¨åå¤éå ã®åéåã¯ããã観ç¹ããã¯å対ãªã®ã§ãããã®ãã¨ã¯ãã¨ã³ãï¼ã³ã¨ã³ãã®å対æ§ãè¦ãã¨ãã«ä½¿ãã¾ãã
ç·ç´ç©ã®å°å½±ã¨ç·ç´åã®å ¥å°
$`I`$ ã¯ã¤ã³ããã¯ã¹éåã ã¨ãã¦ã$`A`$ 㯠$`I`$ ã§ã¤ã³ããã¯ã¹ä»ããããéåæã$`I`$-indexed family of setsãã ã¨ãã¾ããã¤ã¾ãï¼
$`\quad A:I \to |\mbf{Set}| \In \mbf{SET}`$
éåæ $`A`$ ã®ç·ç´ç©ããã¤åãã¨ç·ç´åãã·ã°ãåãã¯æ¬¡ã®ããã«æ¸ãã¾ãã
- ç·ç´ç©ï¼ $`\prod_{i\in I}A(i)`$ ã¾ã㯠$`{\displaystyle \prod_{i\in I}A(i)}`$
- ç·ç´åï¼ $`\sum_{i\in I}A(i)`$ ã¾ã㯠$`{\displaystyle \sum_{i\in I}A(i)}`$
ç·ç´ç©ã¯éååã«ããã極é対象ãç·ç´åã¯ä½æ¥µé対象ã§ãããã¨ã«æ³¨æãã¦ãã ããã極é対象ããã¯å°å½±ãprojectionãããããä½æ¥µé対象ã¸ã®å ¥å°ãinjection | ä½å°å½± | coprojectionããããã¾ããå°å½±ã¨å ¥å°ã¯æ¬¡ã®ããã«æ¸ããã¨ã«ãã¾ãã
$`\text{For } a\in I \\
\quad \pi^a : {\displaystyle \prod_{i\in I}A(i)} \to A(a) \In \mbf{Set}\\
\quad \iota_a : A(a) \to {\displaystyle \sum_{i\in I}A(i)} \In \mbf{Set}
`$
å ¥å°ã¯åå°ã§ããå ¥å°ãå å«ååã ã¨ã¿ãªãã¦ã次ã®ããã«èãããã¨ãå¤ãã§ããï¼ãã¤ãå å«ã¨ã¿ãªããã¨ã¯è¨ã£ã¦ã¾ãããï¼
$`\quad A(a) \subseteq {\displaystyle \sum_{i\in I}A(i)}`$
ç·ç´ç©ããã¤åãã¨ç·ç´åãã·ã°ãåãã®ããã ã«ã¯æ¬¡ã®é¢ä¿ãããã¾ãã
$`\quad {\displaystyle \prod_{i\in I}A(i)} = \mrm{Sect}(\pi : {\displaystyle \sum_{i\in I}A(i)} \to I)
`$
ããã§ã$`\pi`$ ã¯ãã³ãã«ã®å°å½±ã§ãããç·ç´ç©ã®å°å½±ãæåå°å½±ã$`\pi^a`$ ã¨ã¯å¥ç©ã§ããã©ã¡ãããå°å½±ãã¨å¼ã¶ã®ã§æ³¨æãã¦ãã ããã$`\mrm{Sect}`$ ã¯ããã³ãã«ã®ã»ã¯ã·ã§ã³éã®éåã表ãã¾ãããã³ãã«ã®å°å½±ãå ¨å°ã§ãªããªããã»ã¯ã·ã§ã³ããªãã®ã§ç·ç´ç©ã¯ç©ºéåã«ãªãã¾ãã
ç·ç´ç©ããã¤åãã®å°å½±ãæåå°å½±ã $`\pi^a`$ ã¯ãã»ã¯ã·ã§ã³ãã¤ã³ããã¯ã¹ç¹ $`a`$ ã§è©ä¾¡ãevaluationããããã¨ãªã®ã§ã次ã®ããã«æ¸ãã¾ãã
$`\text{For } a\in I \\
\text{For } s\in {\displaystyle \prod_{i\in I}A(i)}\\
\quad \pi^a(s) = s(a) \; \in A(a)
`$
ã¾ããç·ç´åãã·ã°ãåãã®å ¥å°ããã¡ã¤ãã¼åãè¾¼ã¿ã $`\iota_a`$ ã¯ãã¿ã° $`a`$ ã«ããã¿ã®ã³ã°ã ã¨èãã¦ã次ã®ããã«æ¸ãã¾ãã
$`\text{For } a\in I \\
\text{For } x\in A(a)\\
\quad \iota_a(x) = (a, x) \; \in {\displaystyle \sum_{i\in I}A(i)}
`$
ã¤ã³ããã¯ã¹å¼æ° $`a\in I`$ ã«ããè©ä¾¡ã¨ãã¿ã° $`a\in I`$ ã«ããã¿ã®ã³ã°ã¯ããã観ç¹ããã¯å対ãªæä½ãªã®ã§ãã
éåã«å¯¾ããå°ã®å·¦ä½ç¨ã¨å³ä½ç¨
$`\cat{C}`$ ãå°ããåã$`P`$ ãèªå·±ããé¢æã ã¨ãã¾ããã¤ã¾ãï¼
$`\quad P: \cat{C}^\op \times \cat{C} \to \mbf{Set} \In \mbf{CAT}`$
èªå·±ããé¢æãæ£æ¹è¡åã«ãªãããã¦ã対象 $`x\in |\cat{C}|`$ ã«å¯¾ãã $`P(x, x)`$ ã対è§æåãdiagonal componentãã¨å¼ã¶ãã¨ã«ãã¾ãã$`x \mapsto P(x, x)`$ ã¯ã$`|\cat{C}|`$ ãã¤ã³ããã¯ã¹éåã¨ããéåæã«ãªãã¾ããã¨ã³ãï¼ã³ã¨ã³ãã§ã¯ãèªå·±ããé¢æã®å¯¾è§æåéåæãéè¦ãªå½¹å²ãæ¼ãã¾ãã
ããé¢æã«é¢ãã¦ããã®å·¦ä½ç¨ã¨å³ä½ç¨ãå®ç¾©ã§ãã¾ãï¼ãç¶æ é·ç§»ç³»ã¨ãã¦ã®å層ã»ä½å層ã»ããé¢æãåç §ï¼ãããã§ã¯ãäºç¨®é¡ã®å·¦ä½ç¨ãäºç¨®é¡ã®å³ä½ç¨ãåè¨å種é¡ã®ä½ç¨ã«æ³¨ç®ãã¾ãã
$`f:a \to b\In \cat{C}`$ ã«å¯¾ãã¦ã次ã®å³ã®ãããªå³ä½ç¨ $`\RIGHT_f`$ ãå·¦ä½ç¨ $`\LEFT_f`$ ãèãã¾ãã
$`\text{For }f: a\to b \In \cat{C}\\
\quad \xymatrix {
P(a, a) \ar[dr]_{\RIGHT_f}
& {}
& P(b, b) \ar[dl]^{\LEFT_f}
\\
{}
& P(a, b)
& {}
}\\
\quad \In \mbf{Set}
`$
å ·ä½çãªå®ç¾©ã¯æ¬¡ã®ããã§ãã
- $`\RIGHT_f := P(\o{\id_a}, f)`$
- $`\LEFT_f := P(\o{f}, \id_b)`$
ããã§ã$`\o{f}`$ ã¯ã$`\cat{C}^\op`$ ã®å°ã¨ã¿ãªãã $`f`$ ã®ãã¨ã§ãï¼ãã®ãªã¼ãã¼ã©ã¤ã³è¨æ³ãä¸ç·è¨æ³ãã¯ãç¶æ é·ç§»ç³»ã¨ãã¦ã®å層ã»ä½å層ã»ããé¢æãã§å°å ¥ãã¾ããï¼ãå対åã®å°ã示ããªã¼ãã¼ã©ã¤ã³ã¨ã$`R, L`$ ã®ä¸ã«å¼ãã¦ãããªã¼ãã¼ã©ã¤ã³ã¨ã¯ç¨æ³ãå ¨ç¶éãã®ã§æ³¨æãã¦ãã ããã
次ã«ã$`g:b \to a\In \cat{C}`$ ã«å¯¾ãã¦ã次ã®å³ã®ãããªå³ä½ç¨ $`\CORIGHT^g`$ ãå·¦ä½ç¨ $`\COLEFT^g`$ ãèãã¾ãã
$`\text{For }g: b\to a \In \cat{C}\\
\quad \xymatrix {
{}
& P(a, b) \ar[dl]_{\CORIGHT^g} \ar[dr]^{\COLEFT^g}
& {}
\\
P(a, a)
& {}
& P(b, b)
}\\
\quad \In \mbf{Set}
`$
å ·ä½çãªå®ç¾©ã¯æ¬¡ã®ããã§ãã
- $`\CORIGHT^g := P(\o{\id_a}, g)`$
- $`\COLEFT^g := P(\o{g} , \id_b)`$
ã¨ã³ãï¼ã³ã¨ã³ãã®å®ç¾©
$`\cat{C}`$ ãå°ããåã$`P`$ ãèªå·±ããé¢æã ã¨ãã¾ãã
èªå·±ããé¢æ $`P`$ ã®ã¨ã³ããå®ç¾©ããããã«ã$`f:a \to b\In \cat{C}`$ ãã¨ã«æ¬¡ã®å³å¼ï¼å¯æå³å¼ã§ã¯ãªãï¼ï¼ãèãã¾ãã
$`\quad
\xymatrix{
{}
& {\displaystyle \prod_{x\in |\cat{C}| } P(x, x) }
\ar[dl]_{\pi^{a,a}} \ar[dr]^{\pi^{b, b}}
& {}
\\
P(a, a) \ar[dr]_{\RIGHT_f}
& {}
& P(b, b) \ar[dl]^{\LEFT_f}
\\
{}
& P(a, b)
& {}
}\\
\quad \In \mbf{Set}
`$
ãã®ã²ã¨ã¤ã®å³å¼ã«å¯¾ãã¦ã²ã¨ã¤ã®æ¹ç¨å¼ãä½ããã¨ãã§ãã¾ãã
$`\quad \pi^{a, a} ; \RIGHT_f = \pi^{b, b} ; \LEFT_f \On {\displaystyle \prod_{x\in |\cat{C}| } P(x, x) }`$
$`f`$ ãåããã¦ããã¨ãã¤ã³ããã¯ã¹éå $`\mrm{Mor}(\cat{C})`$ ã§ã¤ã³ããã¯ã¹ä»ããããé£ç«æ¹ç¨å¼ç³»ã«ãªãã¾ãã$`a = \mrm{dom}(f), b = \mrm{cod}(f)`$ ã«æ³¨æãã¦ãã ããã
$`\quad \left( \pi^{a, a} ; \RIGHT_f = \pi^{b, b} ; \LEFT_f \On {\displaystyle \prod_{x\in |\cat{C}|} P(x, x)} \right)_{f \in \mrm{Mor}(\cat{C})}`$
é£ç«æ¹ç¨å¼ç³»ãããã®ã§ããã®è§£ç©ºéãèãããã¨ãã§ãã¾ãã
$`\quad \left\langle \pi^{a, a} ; \RIGHT_f = \pi^{b, b} ; \LEFT_f \On {\displaystyle \prod_{x\in |\cat{C}|} P(x, x) }\right\rangle_{f \in \mrm{Mor}(\cat{C})}`$
ããã $`P`$ ã®ã¨ã³ããendãã®å®ç¾©ã§ãã
次ã«ãèªå·±ããé¢æ $`P`$ ã®ã³ã¨ã³ããå®ç¾©ããããã«ã$`g:b \to a\In \cat{C}`$ ãã¨ã«æ¬¡ã®å³å¼ï¼å¯æå³å¼ã§ã¯ãªãï¼ï¼ãèãã¾ãã
$`\quad
\xymatrix {
{}
& P(a, b) \ar[dl]_{\CORIGHT^g} \ar[dr]^{\COLEFT^g}
& {}
\\
P(a, a) \ar[dr]_{\iota_{a, a} }
& {}
& P(b, b) \ar[dl]^{\iota_{b, b} }
\\
{}
& {\displaystyle \sum_{x\in |\cat{C}|} P(x, x) }
& {}
}\\
\quad \In \mbf{Set}
`$
ãã®ã²ã¨ã¤ã®å³å¼ã«å¯¾ãã¦ã²ã¨ã¤ã®é¢ä¿ï¼ä¸ç½®é¢ä¿è¨å·ã§æ¸ãï¼ãä½ããã¨ãã§ãã¾ãã
$`\text{For }g:b \to a \In \cat{C}\\
\text{For }p, q \in {\displaystyle \sum_{x\in |\cat{C}|} P(x, x) } \\
\quad p \sim_g q :\Leftrightarrow \exists t \in P(a,b).\, p = (\CORIGHT^g; \iota_{a, a})(t) \land q = (\COLEFT^g ; \iota_{b, b})(t)
`$
$`g`$ ãåããã¦ããã¨ãã¤ã³ããã¯ã¹éå $`\mrm{Mor}(\cat{C})`$ ã§ã¤ã³ããã¯ã¹ä»ããããé¢ä¿æã«ãªãã¾ãã$`b = \mrm{dom}(g), a = \mrm{cod}(g)`$ ã«æ³¨æãã¦ãã ããã
$`\quad \left( \sim_g \On {\displaystyle \sum_{x\in |\cat{C}|} P(x, x)} \right)_{g \in \mrm{Mor}(\cat{C})}`$
é¢ä¿æãããã®ã§ããã®åå¤éå ã®åéåãèãããã¨ãã§ãã¾ãã
$`\quad \left[ \sim_g \On {\displaystyle \sum_{x\in |\cat{C}|} P(x, x)} \right]^{g \in \mrm{Mor}(\cat{C})}`$
ããã $`P`$ ã®ã³ã¨ã³ããcoendãã®å®ç¾©ã§ãã
ãããã«
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