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I saw a reference to ["Arb: Efficient Arbitrary-Precision Midpoint-Radius Interval Arithmetic"](https://arxiv.org/abs/1611.02831) on [hackernews](https://news.ycombinator.com/item?id=26054520); it wou…
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Add interval types to enable interval arithmetic.
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```
What steps will reproduce the problem?
In [18]: mpi(1.0)+mpi(1.0)*(mpi(0.01)**2)+mpi(2.0)*mpi(0.01)
Out[18]: [1.0200999999999997847, 1.0201000000000002288]
In [19]: a=mpi(1.0)*(mpi(0.01)**2)+mpi(…
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http://www.postgresql.org/docs/9.3/static/datatype-datetime.html#DATATYPE-INTERVAL-INPUT
https://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_date-add
Is this on the roadmap…
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```
What steps will reproduce the problem?
In [18]: mpi(1.0)+mpi(1.0)*(mpi(0.01)**2)+mpi(2.0)*mpi(0.01)
Out[18]: [1.0200999999999997847, 1.0201000000000002288]
In [19]: a=mpi(1.0)*(mpi(0.01)**2)+mpi(…
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```
What steps will reproduce the problem?
In [18]: mpi(1.0)+mpi(1.0)*(mpi(0.01)**2)+mpi(2.0)*mpi(0.01)
Out[18]: [1.0200999999999997847, 1.0201000000000002288]
In [19]: a=mpi(1.0)*(mpi(0.01)**2)+mpi(…
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Hi, does the sympy can not handle mpmath interval variable with different lower bound and upper bound? here is a demo
```python
def f(x):
expr0 = x[0] * 2
expr1 = x[1] +…
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```
Consider the following operation:
a = iv.mpf([0,1])
b = 0.5
min(a,b)
Mpmath returns the range [0,1] though there is no posible value of a that can give a result greater than 0.5
The correct re…
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It looks like the current SymPy master branch interprets the `+` operator as an interval union, which looks as an abuse of notation, since we already have the `|` operator, and `+` has another meaning…
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The enhacements of `interval_arithmetic` implementation.