#2452: [with patch, needs work] Heaviside step function, Dirac delta needed
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Reporter: gfurnish | Owner: gfurnish
Type: enhancement | Status: assigned
Priority: major | Milestone: sage-4.1
Component: symbolics | Keywords:
Reviewer: | Author:
Merged: |
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Comment(by burcin):
Sorry for doing this in such small pieces, but I have one more suggestion.
You can change the calls to the `_is_real()` function by `x in RR` where
you import `RR` from `sage.rings.real_mpfr`. The semantics of the
`__contains__()` method in Sage is similar to your `_is_real()`, though it
also checks that `approx_x == x` in your code.
BTW, the reason `exp(-100000000000)` is evaluated to be 0 is that we don't
use interval fields to do the numerical approximation. This is also
##5993.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/2452#comment:15>
Sage <http://sagemath.org/>
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