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?

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