>
> > Problems arise when thinking about more complicated mathematical
>> objects. I
>> > don't know if I simply lack the appropriate Mathematica knowledge, but
>> years
>> > ago, when I implemented matroids in Mathematica, a matroid was simply a
>> list
>> > with 6 elements (groundset, representation matrix, and I forget what
>> else)
>> > and head Matroid. To access the elements of that list, you did stuff
>> like
>> > this:
>> >
>> > lM = Map[If[# == 0, 0, 1] &, M[[2]][[#[[2]] & /@ M[[3]], #[[2]] & /@
>> > M[[4]]]], {2}];
>>
>> Holy f*2}];ng s&/@!
>>
>>
>
Let's hope the younger matroid theorists never have to see such obfuscated
code again, thanks to your (and others') work!
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