When i want to use this expression, I always get the warning :

错误使用 .*

Disciplined convex programming error:

Cannot perform the operation: {real affine} .* {convex}

However, x*exp(inv_pos(x)) is definitely convex considering x is positive

This is an exponential cone

```
variables x z
{1,x,z} == exponential(1)
```

Then use `z`

in place of `x*exp(1/x)`

I really appreciate your help, thank you so much!