Hi,
I've recently faced this surprising appearance of a logarithm (in Sage
6.7.beta3 as well as in any older versions I've tried, down to Sage 6.3):
sage: var('y')
y
sage: f = function('H', x, y); f
H(x, y)
sage: loads(dumps(f))
-x*log(-x*y + 1)
If we use a lower case symbol, it is fine:
sage: loads(dumps(function('h', x, y)))
h(x, y)
If we use any upper case letter but 'H' and 'G', it is fine as well:
sage: loads(dumps(function('A', x, y)))
A(x, y)
For 'G' it is worse: we get a segmentation fault:
sage: loads(dumps(function('G', x, y)))
...
Unhandled SIGSEGV: A segmentation fault occurred in Sage.
Note that for functions of a single variable, there is no problem: both 'H'
and 'G' works; for functions of 3 variables, 'H' works but 'G' still
generates a seg. fault.
Eric.
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