# Paper model

### Model 842

 Category: G 47

### Description

Paper model of the function $u= a(1-e^{-c_1x_1}) (1-e^{-c_2x_2})$; $8=a$, $c_1=0,2$, $c_2=0,3$ (for biology; $x_1,x_2$ are growth factors, $u$ is the gain)

Showcase of this model is Case number 64