Hello,

I want to calculate the absolute humidity in a room to decide about ventilation. Therefore I use calculations that require exponents for formulas as described here: https://www.wetterochs.de/wetter/feuchte.html

Unfortunately when I have a line like

`val sdd = 6.1078 * 10^((7.5*temp)/(237.3+temp))`

I get the error

```
Configuration model 'air_climate.rules' has errors, therefore ignoring it: [33,24]: no viable alternative at input '^'
[35,14]: no viable alternative at input '^'
```

I didn’t find a description or guide about mathematics in rules, so I would be glad if somebody could give me a hint whether this is possible at all.

Thanks a lot in advance!