I had thought that perhaps the D'ni computers could be more crystalline/analogue which didn't have any resemblance to what we would recognize as a computer. Also I was under the impression that our computers are binary because they evolved from a collection of switches or punch-card programming where there could be only two variables, on or off, hole or solid. So a different origin would likely evolve in an entirely different direction.
We don't have access to ANY documents that would have any chance of displaying D'ni maths of any sort. If we had free rein of the Guild Hall, Takota buildings or even the lower reaches of the Public Library/Museum then perhaps we might come across such documents. What we have for the most part are translations of D'ni historical text books, where I would be surprised to find much in the way of even the most basic of maths.
The Guild of Writers had VERY strict guidelines of what was and was not allowed to be written into an age. One of the biggest no-no's was the writing of artificial artifacts, and I somehow think that would cover ice-cream cones

Atrus might have experimented with Stoneship but he was hardly guild trained. Such an age would have had him dismissed in disgrace from the Guild faster then you can say Kor-mahn.

Also to achieve a specific result in an age you need to describe the circumstances for it to arise in in great detail. Atrus was able to reproduce, on his first age "Inception", the Blue flowers from the Cleft because he had studied the precise makeup of the soil where they grew, in addition to the description of the flowers. The Art was the art of Precise description using highly specialized language, not vague descriptions of a novel.
As for the enslavement of other races, I don't believe that it was common practice for D'ni to enslave every race they came across. I believe that any enslavement was strictly illegal and only carried out in a black-market fashion (the slave caves in Teledahn were not accessible from the back entrance when the bridge was up and the front entrance was concealed by water whenever the Maintainers came to examine the premises. At least, thats how I understand it). The founding principles of Ri'neref prohibited the D'ni from such actions, it was the reason that D'ni was founded in the first place, to be different from Terahnee.
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