Section 8 of the new, ¡­

Section 8 of the new, English version of the notes on hyperbolic geometry have now been posted, and the last section will follow tomorrow. Note that the order of these sections have been switched from the old version. There are also some minor changes in the presentation, and a few more exercises have been added.

Yesterday I introduced the arc length functions in the two models H and D and computed the arc-length of a circle. Next time I will begin with the concept of area in the hyperbolic plane and hopefully also go on to the last section on trigonometric formulae.

Note that here will be regular classes October 9. and 10.