"The Dangerous Dimension" is L. Ron Hubbard's first science fiction story, written at editor F Orlin Tremaine's request for something light, easy-reading, and humorous. In the story, Professor Henry Mudge, by thinking about negative dimensions, comes up with "Equation C", at which the mere sight one gains the ability to teleport just by thinking of the destination. Unfortunately, the teleportation happens whether or not you actually wish to go. Mudge has great difficulty controlling himself, but by forcing himself to work out "Equation D" he gains control.

No real mathematical content, just classic pulp mumbojumbo. The story could just as well have been written with "C rays" or "element D", but Hubbard apparently thought mathematics sounded better.