# Limit generating an error

SageMath return a strange error in evaluating the following limit.

```
var('x a b γ')
U_5 = lambda x, a, b, γ: ((1-γ)/γ)*(((a*x)/(1-γ))+b)^γ
U_5(x, a, b, γ)
limU=lim(U_5(x, a, b, γ), γ=1)
show(LatexExpr(r"\lim_{\gama\rigtharrow 1}U_5(x, a, b, γ) = "),limU)
```

Incidently it's not a problem linked to unicode variables since I have the same result in substituting c for γ.

Here is the error message

```
ECL says: BINDING-STACK overflow at size 10240. Stack can probably be resized.
Proceed with caution.
```

Incidently the result is well known (a linear function of x) and in one of my numerous essays I have had this result but changing the display I loose it and again I have the same error message..