|Parameters||n, a number|
|Purpose||Determines if v is a complex number (including an optional complex part).|
|Produces||A truth value: true (|
|Preconditions||Only one parameter (verified).|
|Postconditions||Returns true if and only if the parameter is a complex number.|
> (complex? (sqrt -1)) #t > (complex? 1) #t > (complex? 3/2) #t > (complex? -1/2) #t > (complex? 1.3) #t > (complex? (sqrt 2)) #t > (complex? 'a) #f
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