Comment #9 on issue 564 by asmeurer: series expansion of acosh and acoth http://code.google.com/p/sympy/issues/detail?id=564
No, I think they are just not implemented because no one has done it yet. The same for sec, csc, cot, asec, scsc, and acot. By the way, if you are interested in those, there is some old code at https://github.com/hazelnusse/sympy/tree/trig which never got finished that you might start with (I don't think he ever did work on hyperbolic functions, just regular trig ones, but I may be wrong).
I just remembering discussing with Luke (the author of that branch) the different choices for branch cuts for one of the inverse functions (I think it was asec). They had different advantages (for example, one was a continuous function), but once you chose one for one function, you had to choose all the others to be consistent. I was just wondering if this spilled over to the hyperbolic functions. Maybe it would be clear if you wrote the arc-trig functions as complex logarithms and considered what logarithm branch cut they are using.
-- You received this message because you are subscribed to the Google Groups "sympy-issues" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/sympy-issues?hl=en.
