I am a software developer and part-time professor. I enjoy studying and discussing mathematics, computer science and software development.

## Combinations Part 5 – (wrapping it up)

The original problem as posed by Eric Lippert was to write a function to produce all the combinations of k elements from a collection of n elements. So far I’ve ported the code to product all the combinations of k … Continue reading

## Combinations – Part 4 (combinations of booleans)

In this article we’ll implement the combinations function from Eric Lippert’s post. Here he implements a function that returns all the combinations of n booleans with k of them set to true. See part 3 of his series. Let’s implement … Continue reading

## Combinations – Part 3 (SequenceOf extensions)

I want to continue on with my implementation of Combinations. But first, when working on this problem I determined I really needed some helper methods on SequenceOf. Initially these were very complicated but as my comfort level increased I figured … Continue reading

## Combinations – Part 2

Last time I started working on the combinations problem that Eric Lippert wrote about: We’ll be working a lot with SequenceType, SequenceOf, GeneratorType and GeneratorOf. I’m more familiar with the enumerating type of C# (IEnumerable and IEnumerator). Together SequenceType and … Continue reading

## Combinations – Part 1

I’ve had a difficult time trying to understand the collections in the Swift programming language from Apple. In particular, I’ve been trying to identify the analog of the IEnumerable type from C#. I don’t think there is one. As an … Continue reading

Last time I developed a representation of Natural numbers following Eric Lippert’s lead. In this post I’ll continue to follow him and implement addition.

## Math from scratch in Haskell: zero and one

I’ve been following a set of posts written by Eric Lippert where he is implementing arbitrary size Naturals and the corresponding arithmetic in C#. As I follow along I’m writing an implementation in Haskell (one that I hope is idiomatic … Continue reading

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## Importing Subversion Into Git

Over the years I’ve accumulated some Subversion repositories. I used Subversion to control the source code I wrote for my masters courses. These repositories are sprinkled around a couple of computers I own. Now that I have accounts on GitHub … Continue reading