=========== SymPy 0.5.4 =========== 5 Oct 2007 * ``Log`` and ``ApplyLog`` classes were simplified to ``log``, as was in the 0.4.3 version (the same for all other classes, like ``sin`` or ``cos``). * Limits algorithm was fixed and it works very reliably (there are some bugs in the series facility though that make some limits fail), see `this post `_ for more details. * All functions arguments are now accessed using the ``sin(x)[:]`` idiom again, as in the 0.4.3 version (instead of the old ``sin(x)._args`` or ``sin(x).args`` which was briefly introduced in the 0.5.x series).