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mikespivey.wordpress.com | ||
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kristalcantwell.wordpress.com
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| | | | | Mini-polymath 4 has started. It is based on question 3 of the IMO. The research thread is here. There is a wiki here. | |
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dominiczypen.wordpress.com
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| | | | | The starting point of this blog post is a slight reformulation of the $latex T_0$ separation axiom: A topological space $latex (X,\tau)$ is $latex T_0$ if for all $latex x\neq y\in X$ there is a set $latex U\in \tau$ such that $latex \{x,y\}\cap U \neq \emptyset \text{ and } \{x,y\}\not\subseteq U.$ Given a cardinal $latex... | |
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algorithmsoup.wordpress.com
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| | | | | The ``probabilistic method'' is the art of applying probabilistic thinking to non-probabilistic problems. Applications of the probabilistic method often feel like magic. Here is my favorite example: Theorem (Erdös, 1965). Call a set $latex {X}&fg=000000$ sum-free if for all $latex {a, b \in X}&fg=000000$, we have $latex {a + b \not\in X}&fg=000000$. For any finite... | |
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manjubhat.wordpress.com
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| | | 1 post published by Manjunath Bhat on February 27, 2010 | ||
