[Cfp-interest 3055] casinh(x + iNaN) - Annex G.6.3.2
Damian McGuckin
damianm at esi.com.au
Sat Mar 16 03:41:34 PDT 2024
The 4th item in the Dash List says
casinh(x + i NaN) = NaN + i NaN for finite x
Now, for x = 0
casinh(x + i NaN) = casinh(i NaN) .... (1)
For a purely imaginary argument, which is where all this is coming from,
G.7 says
casinh(i NaN) = i asin(NaN) = i NaN
So, Eq(1) above is now
casinh(0 + i NaN) = 0 + i NaN .... (2)
So, I believe that G.6.3.2 is wrong and should say
casinh(x + i NaN) = NaN + i NaN for finite x != 0
and an item to reflect Eq(2) above needs to be added.
Comments please?
Thanks - Damian
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