What others do [Scheme]

> (< 0+0i 1+0i)
#t
> (sqrt -4)
+2i   ;; note exact 2, not 2.0 [extra credit]
> (log -3) ;; known as #ln in Smalltalk
1.0986122886681098+3.141592653589793i
>

FYI,
-KenD

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