HCR - Solution of a Linear System

A liner system can have:

• 0 solutions
• 1 solutions
• $\infty$ solutions

The forces applied by our brain should belong to the friction cones and if I have only 1 solution for $F_{C1},F_{C2},\dots ,F_{Cn}$ no one guaranties me that one specific solution belongs to the friction cones

• It’s much better to have $\infty$ solutions to respect the friction constraints.