For formulae, used Markdown math mode
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@ -17,13 +17,13 @@ implement a dictionary. Just a few are:
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* Many, many more ....
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* Many, many more ....
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Each of these approaches has their own performance characteristics,
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Each of these approaches has their own performance characteristics,
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memory footprints etc. For example, a table of size n with open
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memory footprints, etc. For example, a table of size $n$ with open
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addressing has no collisions and holds up to n elements, with a single
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addressing has no collisions and holds up to $n$ elements, with a single
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comparison for successful lookup, and a table of size n with chaining
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comparison for successful lookup, and a table of size $n$_ with chaining
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and k keys has the minimum max(0, k-n) collisions and O(1 + k/n)
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and $k$ keys has the minimum $\max(0, k-n)$ collisions and $\mathcal{O}(1 + k/n)$
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comparisons for lookup. While for skip lists the performance
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comparisons for lookup. While for skip lists the performance
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characteristics are about as good as that of randomly-built binary
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characteristics are about as good as that of randomly-built binary
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search trees - namely (O log n). So the choice of which to select
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search trees - namely ($\mathcal{O}(\log n)$). So the choice of which to select
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depends very much on memory available, insert/read characteristics,
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depends very much on memory available, insert/read characteristics,
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etc. So delegating the choice to a single point in your code is a very
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etc. So delegating the choice to a single point in your code is a very
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good idea. Unfortunately, in Erlang that's so easy to do at the moment.
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good idea. Unfortunately, in Erlang that's so easy to do at the moment.
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