Roadmap proposal for 3.10/4.0

Damien Cassou damien.cassou at laposte.net
Tue Oct 17 19:07:56 UTC 2006


Ken Dickey a écrit :
>   -4 sqrt. "2.0i"

If I remember correctly what my math teacher taught me, this is incorrect.


Rule of square roots:
---------------------
a sqrt * b sqrt = (a*b) sqrt

Applied to -4:
--------------
(-4) sqrt * (-4) sqrt = 16 sqrt = 4

With your equality:
-------------------
(-4) sqrt * (-4) sqrt = 2i * 2i = -4


We then have the same expression returning two different values. My 
teacher concluded saying "sqrt is a function only valid for positive 
numbers"

Bye

-- 
Damien Cassou




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