1 | initial version |

First, what do you want to solve? It's a function, not an equation. Do you want to solve `loesung(lambda_z, s_k) = 0`

? Do you want to compute `loesung(5, 4)`

? Second, I believe that the line defining `loesung`

will overwrite the previous definition of `lambda_z`

, making it a symbolic variable instead of just being 5.

So perhaps:

```
\begin{sagesilent}
lambda_za = 5 # note the 'a' at the end
s_ka = 4
loesung (lambda_z, s_k) = lambda_z * s_k
\end{sagesilent}
$ \sage {loesung }$
This will print out 20:
$ \sage {loesung(lambda_za, s_ka) }$
```

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