Mathematical formulas - general

Greetings!

OK, the intro text reads:

> This section describes functions for various mathematical functions, 
> including trigonometric functions like SIN <file:///SIN>). Note that 
> the constraint text presumes that a value of type Number is a real 
> number (no imaginary component). Unless noted otherwise, all angle 
> measurements are in radians.
>
Err, what "the constraint text presumes that a value of type Number is a 
real number (no imaginary component)."?

Ah, after taking a break, does this mean that N in the "constraints" 
text of each function is supposed to be of type Number and a real number?

Err, ok, so what happens with ABS? "Constraints: None." Does that mean I 
can apply ABS to a complex number? (it is defined but I suspect we mean 
to exclude that and other definitions for absolute value).

Ouch. If true, two possible JIRA issues to file:

1) Explicitly state that all functions in mathematical functions accept 
N of type Number and real number. (Or do we define real number or a 
source where we can simply cite it?)

2) Once that is corrected, do we need to do anything about an 
unconstrained ABS function?

Hope everyone is having a great day!

Patrick



-- 
Patrick Durusau

Chair, V1 - US TAG to JTC 1/SC 34
Convener, JTC 1/SC 34/WG 3 (Topic Maps)
Editor, OpenDocument Format TC (OASIS), Project Editor ISO/IEC 26300
Co-Editor, ISO/IEC 13250-1, 13250-5 (Topic Maps)