Moreover, there are only four hyperbolic honeycombs with material vertices and material cells (the cells are entirely inside of hyperbolic space), eleven with ideal vertices or cells (the cells touch the boundary of hyperbolic space in some way), and all others have either hyperideal vertices or hyperideal cells (the cells go outside of the boundary of hyperbolic space in some way).
Source: wiktionary
“From the many' reports that have appeared on the subject it is evident that the '606, or 'Hyperideal,' or whatever other name it may bear by the time these words are published, does not keep well, the injection is painful, and the fever and other signs of a reaction compel vigilant oversight for a few days.
Source: wiktionary
In one case of iritis a severe bilateral neuritis developed about three weeks after the injection of hyperideal.
Source: wiktionary
The reason why the hyperideal is not sold while salvarsan is, as far as we know, has not been made public.
Source: wiktionary
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