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这是我在两年前写的一点东西,现在稍微整理一下，删去了错误的内容，贴到这里.一个函数在某一点处连续的定义是：$$\lim_{x\to a}f(x)=f(a)$$.这条式子说的是：对于任意给定的$\varepsilon >0$,都存在$ \delta >0$,使得$|x-a|$0.则$f(x)$在$[a... 阅读全文
posted @ 2013-01-29 12:07
叶卢庆
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Let $X$ be a set, and let $\Omega$ be the space of all pairs $(Y,\leq)$,where $Y$ is a subset of $X$ and $\leq$ is a well ordering of $Y$.If $(Y,\leq)... 阅读全文
posted @ 2013-01-29 02:19
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Let $X$ be a set, and let $\Omega$ be the space of all pairs $(Y,\leq)$,where $Y$ is a subset of $X$ and $\leq$ is a well ordering of $Y$.If $(Y,\leq)... 阅读全文
posted @ 2013-01-29 02:19
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Let $X$ be a set,and let $\Omega\subset 2^X$ be a collection of subsets of $X$.Assume that $\Omega$ does not contain the empty set $\emptyset$”.Using ... 阅读全文
posted @ 2013-01-29 00:52
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Let $X$ be a set,and let $\Omega\subset 2^X$ be a collection of subsets of $X$.Assume that $\Omega$ does not contain the empty set $\emptyset$”.Using ... 阅读全文
posted @ 2013-01-29 00:52
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