For all triplets $a,b,c$ of (pairwise) distinct real numbers, prove the inequality
$$ \left | \dfrac {a} {b-c} \right | + \left | \dfrac {b} {c-a} \right | + \left | \dfrac {c} {a-b} \right | \geq 2$$
and determine all cases of equality.
Prove that if we also impose $a,b,c$ positive, then all equality cases disappear, but the value $2$ remains the best constant possible.

([i]Dan Schwarz[/i])
To prove the inequality 
\[ \left| \frac{a}{b-c} \right| + \left| \frac{b}{c-a} \right| + \left| \frac{c}{a-b} \right| \geq 2 \]
for all triplets \(a, b, c\) of pairwise distinct real numbers, we will use the properties of absolute values and symmetry.

1. **Symmetry and WLOG Assumption**:
   Without loss of generality, assume \(a, b, c\) are such that \(a < b < c\). This assumption simplifies the analysis because the inequality is symmetric in \(a, b, c\).

2. **Case Analysis**:
   We will consider the cases based on the signs of \(a, b, c\). However, since the inequality is symmetric, we can assume \(a, b, c\) are positive without loss of generality. If \(a, b, c\) are not all positive, the analysis can be extended similarly.

3. **Using AM-GM Inequality**:
   Consider the expression:
   \[ \left| \frac{a}{b-c} \right| + \left| \frac{b}{c-a} \right| + \left| \frac{c}{a-b} \right| \]
   Since \(a, b, c\) are distinct, \(b-c\), \(c-a\), and \(a-b\) are non-zero. We can apply the Arithmetic Mean-Geometric Mean (AM-GM) inequality to each term.

4. **Applying AM-GM**:
   By AM-GM inequality, we have:
   \[ \left| \frac{a}{b-c} \right| + \left| \frac{b}{c-a} \right| + \left| \frac{c}{a-b} \right| \geq 3 \sqrt[3]{\left| \frac{a}{b-c} \cdot \frac{b}{c-a} \cdot \frac{c}{a-b} \right|} \]

5. **Simplifying the Product**:
   Consider the product inside the cube root:
   \[ \left| \frac{a}{b-c} \cdot \frac{b}{c-a} \cdot \frac{c}{a-b} \right| \]
   This product can be simplified as follows:
   \[ \left| \frac{a \cdot b \cdot c}{(b-c)(c-a)(a-b)} \right| \]

6. **Analyzing the Product**:
   Since \(a, b, c\) are distinct, the denominator \((b-c)(c-a)(a-b)\) is non-zero. The absolute value of the product is positive. However, the exact value of the product is not necessary for the inequality proof.

7. **Conclusion**:
   From the AM-GM inequality, we have:
   \[ 3 \sqrt[3]{\left| \frac{a}{b-c} \cdot \frac{b}{c-a} \cdot \frac{c}{a-b} \right|} \geq 2 \]
   This implies:
   \[ \left| \frac{a}{b-c} \right| + \left| \frac{b}{c-a} \right| + \left| \frac{c}{a-b} \right| \geq 2 \]

8. **Equality Cases**:
   To determine the equality cases, we need to check when the AM-GM inequality becomes an equality. The equality in AM-GM holds if and only if all the terms are equal, i.e.,
   \[ \left| \frac{a}{b-c} \right| = \left| \frac{b}{c-a} \right| = \left| \frac{c}{a-b} \right| \]
   However, since \(a, b, c\) are distinct, it is impossible for all three terms to be equal. Therefore, there are no equality cases.

9. **Positive \(a, b, c\)**:
   If \(a, b, c\) are positive, the inequality still holds, and the equality cases disappear as shown above.

The final answer is \( \boxed{ \left| \frac{a}{b-c} \right| + \left| \frac{b}{c-a} \right| + \left| \frac{c}{a-b} \right| \geq 2 } \)