Talk:Triangular array
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Was that a good idea?
@David Eppstein: Er, your edit changed a definition that I thought was helpful precisely because it was more formal than the previous informal one to basically a repetition of the previous sentence. I wanted to use formal mathematical notation like aij. (The exact wording I chose has the benefit of being correct whether you're using 1-based or 0-based indexing.)
I'd rather include something more formal like I originally wrote, or just delete the redundant sentence. Since either would do violence to your edit, could we discuss it?
(I was also thinking of describing the standard implementation in computer memory per https://stackoverflow.com/questions/17406593/triangular-array but the inverse mapping is a bit tricky. I.e. given k = i(i+1)/2 + j, how do I re-derive i? It's something messy involving the integer square root.)