suppose that $A$ is the set of all Closed intervals $[a,b] \subset \mathbb{R}$. Find all functions $f:\mathbb{R} \rightarrow A$ such that
$\bullet$ $x \in f(y) \Leftrightarrow y \in f(x)$
$\bullet$ $|x-y|>2 \Leftrightarrow f(x) \cap f(y)=\varnothing$
$\bullet$ For all real numbers $0\leq r\leq 1$, $f(r)=[r^2-1,r^2+1]$

Proposed by Matin Yousefi
1. **Define the function \( f \):**
   Let \( f(x) = [g(x), h(x)] \). We need to find the functions \( g \) and \( h \) that satisfy the given conditions.

2. **Initial conditions:**
   - \( x \in f(y) \Leftrightarrow y \in f(x) \)
   - \( |x - y| > 2 \Leftrightarrow f(x) \cap f(y) = \varnothing \)
   - For all real numbers \( 0 \leq r \leq 1 \), \( f(r) = [r^2 - 1, r^2 + 1] \)

3. **Lemma:**
   \( f(x) \) cannot be a subset of \( f(y) \) if \( x \neq y \).

   **Proof:**
   Assume for contradiction that \( f(x) \subseteq f(y) \) for \( x \neq y \). Without loss of generality, assume \( x < y \). Select \( a \) such that \( x - 2 < a < \min(x, y - 2) \). Then \( f(a) \cap f(y) = \varnothing \) because \( |a - y| > 2 \). It follows that \( f(a) \cap f(x) = \varnothing \) because \( f(x) \subseteq f(y) \). However, \( 0 < x - a < 2 \), which is a contradiction. Therefore, \( f(x) \) cannot be a subset of \( f(y) \) if \( x \neq y \).

4. **Base Case:**
   For \( 0 \leq x \leq 1 \), we have \( f(x) = [x^2 - 1, x^2 + 1] \). Thus, \( g(x) = x^2 - 1 \) and \( h(x) = x^2 + 1 \).

5. **Inductive Step:**
   Assume \( g \) and \( h \) are defined for \( [n, n+1] \) and satisfy the properties:
   - \( h(x) = g(x) + 2 = g(x + 2) \)
   - \( h(g(x)) = g(h(x)) = x \)

   We need to extend these properties to \( [n+1, n+2] \).

6. **Define \( g \) and \( h \) for \( [n+1, n+2] \):**
   - For \( x \in [n+1, n+2] \), we need to find \( g(x) \) and \( h(x) \) such that the properties hold.

7. **Prove \( g(1 + x) = \sqrt{x} \):**
   Note that \( 1 + x \in f(\sqrt{x}) \), which implies \( \sqrt{x} \in f(1 + x) \). Therefore, \( g(1 + x) \leq \sqrt{x} \).

   For any \( \epsilon > 0 \), \( 1 + x \notin f(\sqrt{x - \epsilon}) \). Therefore, \( \sqrt{x - \epsilon} \notin f(1 + x) \) for any \( \epsilon > 0 \), so \( g(1 + x) = \sqrt{x} \).

8. **Prove \( h(x - 1) = \sqrt{x} \) for \( 0 \leq x \leq 1 \):**
   Similarly, we can prove \( h(x - 1) = \sqrt{x} \).

9. **Prove \( g(2 + x) = h(x) \) for \( 0 \leq x \leq 1 \):**
   First, \( f(2 + x) \cap f(x) \neq \emptyset \). Therefore, \( g(2 + x) \leq h(x) \) and \( h(2 + x) \geq g(x) \).

   For any \( \epsilon > 0 \), \( f(2 + x) \cap f(x - \epsilon) = \varnothing \). Therefore, either \( h(2 + x) < g(x - \epsilon) \) or \( h(x - \epsilon) < g(2 + x) \).

   Since \( h(2 + x) \geq g(x) > g(x - \epsilon) \), we can see that \( h(x - \epsilon) < g(2 + x) \). Therefore, \( (x - \epsilon)^2 + 1 < g(2 + x) \leq x^2 + 1 \), which implies \( g(2 + x) = h(x) \).

10. **Prove \( h(1 + x) = h(x - 1) + 2 \):**
    By our lemma, we can see \( h(1 + x) > h(1) = 2 \). Since \( h(1 + x) \in f(1 + x) \), \( x + 1 \geq g(h(1 + x)) \) and \( 1 + x \leq h(h(1 + x)) \).

    Furthermore, since \( h(1 + x) \notin f(1 + x - \epsilon) \), it follows that \( 1 + x - \epsilon \notin f(h(1 + x)) \), so either \( 1 + x - \epsilon < g(h(1 + x)) \) or \( 1 + x - \epsilon > h(h(1 + x)) \).

    However, \( h(h(1 + x)) \geq 1 + x \), so \( 1 + x - \epsilon < g(h(1 + x)) \) for any \( \epsilon \). It follows that \( g(h(1 + x)) = 1 + x \) for all \( 0 \leq x \leq 1 \). Since \( g \) is injective and \( g(2 + \sqrt{x}) = h(\sqrt{x}) = 1 + x \), it follows \( h(1 + x) = 2 + \sqrt{x} \).

11. **Inductive Step:**
    Assume \( g(n - 1 + x), h(n - 1 + x), g(n + x) \) follow rules 2 and 3. Then we will prove that \( h(n + x), g(n + 1 + x) \) follow these rules as well.

    First, \( f(n + 1 + x) \cap f(n - 1 - x) \neq \emptyset \). Hence, it follows that \( g(n + 1 + x) \leq h(n - 1 + x) \) and \( h(n + 1 + x) \geq g(n - 1 + x) \).

    However, for any \( \epsilon \), we can see \( f(n + 1 + x) \cap f(n - 1 + x - \epsilon) = \varnothing \), so it follows that \( g(n + 1 + x) > h(n - 1 + x - \epsilon) \) or \( h(n + 1 + x) < g(n - 1 + x - \epsilon) \).

    However, we know \( g(n - 1 + x - \epsilon) < g(n - 1 + x) \leq h(n + 1 + x) \), so it must follow that \( h(n - 1 + x) = g(n + 1 + x) \). Similarly, we can prove that \( h(n + x) = 2 + h(n - 2 + x) \).

    Details omitted, this solves the problem.

The final answer is \( \boxed{ f(x) = [g(x), h(x)] } \) where \( g \) and \( h \) are defined as above.