Ultraparallel theorem: Difference between revisions

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:<math>\mbox{inversion in the unit semicircle.}\,</math>
 
Then <math>a \to \infty</math>, <math>b \to (b-a)^{-1},\quad c \to (c-a)^{-1}</math>,\quad <math>d \to (d-a)^{-1}.</math>
 
Now continue with these two hyperbolic motions: