## 20 Reputation

5 years, 179 days

## Convert rational equations to polynomial...

Maple

Suppose I have one or more equations in the variables  , ..., , where each equation is a linear combination of rational functions in  , ..., . For example, one equation might be:

Any such equation can be turned into a polynomial by multiplying both sides by the products of all the denominators. In the example, this would be .

My question is whether there is a Maple command to do this automatically? This would be helpful as I have a large number of equations.

## Bug: Incompatibility between Statistics ...

Maple 2017

See the below. The two answers should be identical, but they are not.

Input:

```
```

Output:

```
```

## Bug: Definite integral of positive funct...

Maple 2016

Let:

`f:=x->1/sqrt(2*Pi)*exp(-x^2/2);`

I.e. f is a standard Gaussian PDF.

Then (in Maple 2016.1):

```Int(convert(f(x)*f(y)*x*x*abs(x+y),piecewise,x),x=-infinity..infinity,y=-infinity..infinity):
evalf(%);```

Returns:

`1.692568751`

However (again in Maple 2016.1):

```int(convert(f(x)*f(y)*x*x*abs(x+y),piecewise,x),x=-infinity..infinity,y=-infinity..infinity):
evalf(%);```

Returns:

`-0.5641895835`

This is clearly incorrect, as the integral of a positive function must be positive.

This also seems to be a problem in which ever version of Maple is used behind the scenes on this forum.

gives:

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