[f1shy]

> With no mathematical rigor there is no mathematical understanding

While I appreciate rigor to really know deep details, is not only not a requirement for understanding, but a hurdle. A terrible insurmountable hurdle.

To first have understanding, I need some kind intuition. Some explanation that makes sense easily. That explanation is btw, what typically the inventor or discoverer had to begin with, before nailing it down with rigor.