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Revision as of 04:06, 29 March 2009
, 04:06, 29 March 2009→Category 2: markup
===Category 2===
===Category 2===
<pre>
{| align="center" cellpadding="8" width="90%" <!--QUOTE-->
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| E1. f 1_A = f,
<p>A ''category'' is a deductive system in which the following equations hold between proofs:</p>
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<p><math>\begin{array}{ll}
\text{E1.} & f 1_A = f, \qquad 1_B f = f, \qquad (hg)f = h(gf),
\\[8pt]
& \text{for all}~ f : A \to B, \quad g : B \to C, \quad h : C \to D.
\end{array}</math></p>
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<p>(Lambek & Scott, 52).
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===Cartesian Category===
===Cartesian Category===
