[squeak-dev] inverse hyperbolic function

Ken G. Brown kbrown at mac.com
Thu Apr 21 22:39:22 UTC 2011


On 2011-04-21, at 15:56, Bert Freudenberg <bert at freudenbergs.de> wrote:

> 
> On 21.04.2011, at 23:52, Ken G. Brown wrote:
> 
>> On 2011-04-21, at 15:16, Bert Freudenberg <bert at freudenbergs.de> wrote:
>> 
>>> 
>>> On 21.04.2011, at 23:01, Levente Uzonyi wrote:
>>> 
>>>> On Thu, 21 Apr 2011, Frank Shearar wrote:
>>>> 
>>>>> On 2011/04/21 21:18, Bert Freudenberg wrote:
>>>>>> On 21.04.2011, at 21:24, Nicolas Cellier wrote:
>>>>>>> Just a question of language: how to name them in English ?
>>>>>>> Using asinh acosh atanh like any other programming language do would
>>>>>>> be that simple...
>>>>>>> But Smalltalk did not follow that path and didn't implement asin acos atan...
>>>>>>> In French, inverse hyperbolic functions are named like this
>>>>>>> argument sinus hyperbolique (argsh ou argsinh)
>>>>>>> http://fr.wikipedia.org/wiki/Fonction_hyperbolique#Argument_tangente_hyperbolique
>>>>>>> So I decided to use argSinh argCosh argTanh quite naturally (like we
>>>>>>> have arcSin arcCos arcTan).
>>>>>>> However I'm not sure English has same conventions. Can someone enlighten me?
>>>>>>> Nicolas
>>>>>> How about hypSin, hypArcSin, etc.? Alternatively, sinHyp, arcSinHyp.
>>>>>> This would fit the existing theme better, since we use arcSin where others use asin, etc. Just appending an "h" looks odd.
>>>>> 
>>>>> Heh, I think appending an "h" looks exactly right :)
>>>>> 
>>>>> http://mathworld.wolfram.com/InverseHyperbolicCosine.html for instance uses "arccosh".
>>>> 
>>>> +1 :)
>>>> 
>>>> Actually searching my image with the message names browser for 'arcSinH', I found the following:
>>>> arcSinH
>>>> testArcSinH
>>>> testArcSinHStd
>>> 
>>> "H" is much better than "h".
>>> 
>>> - Bert -
>>> 
>> 
>> -1
>> Not according to Wolfram. They suggest lower case 'h'.
>> 
>> Ken,
>> from my iPhone
> 
> So what? Wolfram's use of "arc" for the hyperbolic inverse is wrong too, as Nicolas pointed out.
> 
> - Bert -
> 

So let's pretend Wolfram knows something about mathematical notation. 

Ken



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