Le 26/07/2012 18:27, Orchid Win7 v1 nous fit lire :
> On 26/07/2012 05:22 PM, Le_Forgeron wrote:
>> Le 26/07/2012 13:51, Invisible nous fit lire :
>>> Now I can't help but wonder... Is this a coincidence? Or some deep
>>> fundamental result? Is there some way of writing a solution to an
>>> equation like
>>>
>>>    f''(t) = k f(t)
>>>
>>> such that you get exp() or sin() depending on the sign of k?
>>
>> what about f''(t) = exp(abs(sqrt(k)).t) ?
>>
>> when k = -1, abs(sqrt(k)) is i
>> when k = 1, it's 1.
> 
> What do you need abs() for?

well, there is two values for a square root of number from R (only one
exception: 0)

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