# laplace(heaviside(t),t,s) doesn't return 1/s

```
var('s')
var('t',domain='positive')
laplace(heaviside(t),t,s)
```

returns an unevaluated function object in stead of returning `1/s`

. Other functions such as `sin(t)`

and `dirac_delta(t)`

seem to give the correct results. Is this just a blind spot in laplace, or do I need to refine my domains on `s`

or `t`

?

If this transform just isn't implemented, is there an easy way for me to patch it locally?

Hmm, could be that we don't return heaviside to Maxima properly, as they may not have it...