Harry Keogh is a "necroscope" who can communicate with the dead. So, when omens suggest that the Möbius strip and space-time are going to be relevant to his plans in the near future, he goes straight to the expert and starts a conversation with August Ferdinand Möbius himself. Möbius, it seems, has been occupying his time since dying by doing calculations and visiting distant astronomical locations, but was able to offer his assistance in defeating an evil Romanian vampire in this unusual horror tale that Shane Griffo was kind enough to point out to me.
In later novels in the series, Keogh continues to travel using a higher dimensional technique he learned from Möbius and math makes some more appearances. In Necroscope V, for example, he communicates with the spirit of Pythagoras. And, there is a little bit of math in the author's Vampire World series as well.
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