The one idea that connects the workshop

When a problem has no exact answer and no true inverse, you do not give up. You find the best stable approximation instead.

Sections 07, 09 and 10 state it. You watch it happen three times:

1. The pseudoinverse on a real 20,433-equation system that has no exact solution (section 07).
2. Tucker on an oversized tensor, 4.7× smaller at 6.7% error (section 10).
3. Richardson-Lucy on a blurred photograph, where the direct inverse is unusable (take-home F).

Stating that connection out loud at the wrap-up is what makes the second half feel like one lesson rather than four.