I just had a horrid Xover thought:  The Nanoha series and Stross's Laundry series.  Because in both universes, magic is an application of exotic mathematics.
And suddenly, the fall of El-Hazard and all those "dimensional distortions" the TSAB is so desperate to keep under control take on a whole new meaning.
	
	
	
And suddenly, the fall of El-Hazard and all those "dimensional distortions" the TSAB is so desperate to keep under control take on a whole new meaning.

 
 

 
