# From indexed variables to strings

I can easily generate a list of variables with

```
xx = var("x", n=10, latex_name="x")
```

but I have many questions about this

1) `nc`

is the number of variables needed. Say I need variables indexed from 10 to 20, not from 0 to 20. Am I obliged to
generate all 20 variables and let appart the 10 firsts (I have found nothing on options like n=, could it be a range ?).
2) if I have generated the following list `x=[x_1, x_2, x_3, x_4, x_5]`

how may i transform it in a list of strings `x=['x_1', 'x_2', 'x_3', 'x_4', 'x_5']`

3) and what if I need to change the name of certain variable as `'x_3'-->'\\epsilon_2'`