 <0 + \frac{0( \theta+0)}{p \theta-0} t_0^+.$$ Then there is no positive bounded solution of (\[eq\_half\]). In particular there is no positive bounded solution of (\[eq\_half\]) for any $ 0 \le p \le \theta$ if $ N \le 00$; see Remark \[computations\].  0.  Suppose $  0 < p \le \theta$, $ 0 t_0^- <p$ and (\[cond\_syst\]) holds. Then there is no positive bounded solution of (\[eq\_half\]). 