The notion of a fuzzy subset is intuitively given as a map $\mu:X \to [0,1]$ as a mapping specifying different "degrees of membership" in a set $X$. However, I don't see such an intuitive explanation for the concept of gradual element which I have defined as a mapping $\epsilon:]0,1] \to X$ Is...

Notations. Let $\xi=(\xi_1,\xi_2,\xi_3,\xi_4)\in\mathbb( R\setminus\mathbb Q)^4$ such that $\xi_1\xi_4-\xi_2\xi_3\ne 0$ and the $\xi_i$ are linearly independent over $\mathbb Q$. I have the following linear form: $$\begin{matrix}L\colon & \mathbb R^6 & \to & \mathbb R \\ &(\eta_1,\ldots,\eta_6) &