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        <title>Topologia e conjuntos em exercícios</title>
        <description></description>
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       <dc:date>2026-05-06T07:30:26+00:00</dc:date>
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        <title>Topologia e conjuntos em exercícios</title>
        <link>https://sites.icmc.usp.br/aurichi/exerc/</link>
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        <dc:date>2023-05-08T14:35:29+00:00</dc:date>
        <dc:creator>juliajaccoud (juliajaccoud@undisclosed.example.com)</dc:creator>
        <title>solucao:start</title>
        <link>https://sites.icmc.usp.br/aurichi/exerc/doku.php?id=solucao:start&amp;rev=1683567329&amp;do=diff</link>
        <description>A seguinte fórmula  
$$ \forall x (x &lt; 0 \rightarrow x&lt;y) \wedge \exists z (0&lt;z \wedge z&lt;x  )   $$

tem a variável $y$ ocorrendo livre, a variável $z$ ocorrendo ligada ao quantificador existe, portanto, não ocorre livre e finalmente a variável $x$ ocorre ligada ao quantificador para todo na esquerda e ocorre livre na direita.</description>
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        <dc:date>2023-05-08T14:11:13+00:00</dc:date>
        <dc:creator>aurichi (aurichi@undisclosed.example.com)</dc:creator>
        <title>lista:solucao - removida</title>
        <link>https://sites.icmc.usp.br/aurichi/exerc/doku.php?id=lista:solucao&amp;rev=1683565873&amp;do=diff</link>
        <description></description>
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        <dc:date>2023-05-08T14:10:57+00:00</dc:date>
        <dc:creator>aurichi (aurichi@undisclosed.example.com)</dc:creator>
        <title>solucao:modelofinito - criada</title>
        <link>https://sites.icmc.usp.br/aurichi/exerc/doku.php?id=solucao:modelofinito&amp;rev=1683565857&amp;do=diff</link>
        <description>Devemos mostrar que para toda L-fórmula $\varphi$, temos que $\mathcal{M} \vDash \varphi$ se, e somente se, $\mathcal{N} \vDash \varphi.$

Mostremos a ida , sejam  uma L-fórmula $\varphi$ e uma valoração $\beta$ em  $\mathcal{N}$ , consideremos a seguinte valoração $\beta h^{-1}$ em $\mathcal{M}$ , assim pela hipótese ($\mathcal{M} \vDash \varphi[\alpha] ,\forall\alpha$ valoração) e pelo resultado anterior, temos 
$\mathcal{M} \vDash \varphi[\beta h^{-1}]$$\mathcal{N} \vDash \varphi[\beta ]$$h$$…</description>
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        <dc:date>2023-05-08T14:10:48+00:00</dc:date>
        <dc:creator>aurichi (aurichi@undisclosed.example.com)</dc:creator>
        <title>lista:submodeloselementares</title>
        <link>https://sites.icmc.usp.br/aurichi/exerc/doku.php?id=lista:submodeloselementares&amp;rev=1683565848&amp;do=diff</link>
        <description>Relações entre modelos

Dizemos que dois L-modelos $\mathcal{M}$ e $\mathcal{N}$ são isomorfos ($\mathcal{M} \cong \mathcal{N}$) se existe uma bijeção $h: M \rightarrow N$ tal que:

- para todo símbolo relacional R e $a_1,\ldots,a_n \in M$, temos que $R^{\mathcal{M}}(a_1,\ldots,a_n)$ se, e somente se, $R^{\mathcal{N}}(h(a_1),\ldots,h(a_n))$.

- para todo símbolo funcional $f$ e $a_1,\ldots,a_n \in M$, temos que $h(f^{\mathcal{M}}(a_1,\ldots,a_n)) = f^{\mathcal{N}}(h(a_1),\ldots,h(a_n))$

- para …</description>
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        <dc:format>text/html</dc:format>
        <dc:date>2023-03-20T14:11:41+00:00</dc:date>
        <dc:creator>aurichi (aurichi@undisclosed.example.com)</dc:creator>
        <title>lista:modelos</title>
        <link>https://sites.icmc.usp.br/aurichi/exerc/doku.php?id=lista:modelos&amp;rev=1679332301&amp;do=diff</link>
        <description>Modelos

 Esta lista tem como objetivo apresentar como formalizar a ideia de como dizer que uma certa estrutura satisfaz determinados axiomas. Para isso, vamos formalizar como podemos escrever tais axiomas. A primeira parte da lista cuida justamente disso: como os axiomas podem ser escritos de uma maneira formal. Atente que, de começo, as fórmulas não tem qualquer significado - são apenas sequências de símbolos. O que fazemos de início é simplesmente dizer quais sequências estão bem formadas e q…</description>
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        <dc:format>text/html</dc:format>
        <dc:date>2020-11-06T16:24:00+00:00</dc:date>
        <dc:creator>aurichi (aurichi@undisclosed.example.com)</dc:creator>
        <title>wiki:logo.png</title>
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        <dc:date>2020-05-20T19:47:00+00:00</dc:date>
        <dc:creator>gustavo (gustavo@undisclosed.example.com)</dc:creator>
        <title>endpoint2.pdf - criada</title>
        <link>https://sites.icmc.usp.br/aurichi/exerc/doku.php?image=endpoint2.pdf&amp;ns=&amp;rev=1590014820&amp;tab_details=history&amp;mediado=diff&amp;do=media</link>
        <description></description>
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        <dc:date>2020-05-20T19:46:28+00:00</dc:date>
        <dc:creator>gustavo (gustavo@undisclosed.example.com)</dc:creator>
        <title>endpoint1.pdf - criada</title>
        <link>https://sites.icmc.usp.br/aurichi/exerc/doku.php?image=endpoint1.pdf&amp;ns=&amp;rev=1590014788&amp;tab_details=history&amp;mediado=diff&amp;do=media</link>
        <description></description>
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        <dc:date>2020-05-08T20:40:47+00:00</dc:date>
        <dc:creator>gustavo (gustavo@undisclosed.example.com)</dc:creator>
        <title>wiki:infinite_ladder.png</title>
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        <dc:date>2020-05-01T13:39:55+00:00</dc:date>
        <dc:creator>aurichi (aurichi@undisclosed.example.com)</dc:creator>
        <title>inacessiveis-merged.pdf - criada</title>
        <link>https://sites.icmc.usp.br/aurichi/exerc/doku.php?image=inacessiveis-merged.pdf&amp;ns=&amp;rev=1588351195&amp;tab_details=history&amp;mediado=diff&amp;do=media</link>
        <description></description>
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        <dc:format>text/html</dc:format>
        <dc:date>2020-03-17T00:32:06+00:00</dc:date>
        <dc:creator>gustavo (gustavo@undisclosed.example.com)</dc:creator>
        <title>wiki:strategyone.png</title>
        <link>https://sites.icmc.usp.br/aurichi/exerc/doku.php?image=wiki%3Astrategyone.png&amp;ns=wiki&amp;rev=1584415926&amp;tab_details=history&amp;mediado=diff&amp;do=media</link>
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        <dc:date>2020-03-17T00:24:03+00:00</dc:date>
        <dc:creator>gustavo (gustavo@undisclosed.example.com)</dc:creator>
        <title>strategyone.png - criada</title>
        <link>https://sites.icmc.usp.br/aurichi/exerc/doku.php?image=strategyone.png&amp;ns=&amp;rev=1584415443&amp;tab_details=history&amp;mediado=diff&amp;do=media</link>
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        <dc:format>text/html</dc:format>
        <dc:date>2020-03-16T23:15:47+00:00</dc:date>
        <dc:creator>gustavo (gustavo@undisclosed.example.com)</dc:creator>
        <title>wiki:complement_indeterminacy2.png - criada</title>
        <link>https://sites.icmc.usp.br/aurichi/exerc/doku.php?image=wiki%3Acomplement_indeterminacy2.png&amp;ns=wiki&amp;rev=1584411347&amp;tab_details=history&amp;mediado=diff&amp;do=media</link>
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        <dc:format>text/html</dc:format>
        <dc:date>2020-03-16T23:15:46+00:00</dc:date>
        <dc:creator>gustavo (gustavo@undisclosed.example.com)</dc:creator>
        <title>wiki:complement_indeterminacy.png - criada</title>
        <link>https://sites.icmc.usp.br/aurichi/exerc/doku.php?image=wiki%3Acomplement_indeterminacy.png&amp;ns=wiki&amp;rev=1584411346&amp;tab_details=history&amp;mediado=diff&amp;do=media</link>
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        <dc:format>text/html</dc:format>
        <dc:date>2020-03-16T23:13:04+00:00</dc:date>
        <dc:creator>gustavo (gustavo@undisclosed.example.com)</dc:creator>
        <title>complement_indeterminacy2.png - criada</title>
        <link>https://sites.icmc.usp.br/aurichi/exerc/doku.php?image=complement_indeterminacy2.png&amp;ns=&amp;rev=1584411184&amp;tab_details=history&amp;mediado=diff&amp;do=media</link>
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        <dc:format>text/html</dc:format>
        <dc:date>2020-03-16T23:13:04+00:00</dc:date>
        <dc:creator>gustavo (gustavo@undisclosed.example.com)</dc:creator>
        <title>complement_indeterminacy.png - criada</title>
        <link>https://sites.icmc.usp.br/aurichi/exerc/doku.php?image=complement_indeterminacy.png&amp;ns=&amp;rev=1584411184&amp;tab_details=history&amp;mediado=diff&amp;do=media</link>
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        <dc:format>text/html</dc:format>
        <dc:date>2020-03-16T22:34:08+00:00</dc:date>
        <dc:creator>gustavo (gustavo@undisclosed.example.com)</dc:creator>
        <title>wiki:basic_open.png</title>
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        <dc:format>text/html</dc:format>
        <dc:date>2020-03-16T22:22:25+00:00</dc:date>
        <dc:creator>gustavo (gustavo@undisclosed.example.com)</dc:creator>
        <title>wiki:shift_game.png - criada</title>
        <link>https://sites.icmc.usp.br/aurichi/exerc/doku.php?image=wiki%3Ashift_game.png&amp;ns=wiki&amp;rev=1584408145&amp;tab_details=history&amp;mediado=diff&amp;do=media</link>
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