Then both are same because this is 0, so this both can be same which means that the total strength because that will show us the total strength our vortex tube emerging from s 1, the same of emerging out of s 1 will be the same as the strength of the vortex emerging out of s 2. And that is we suggest that we suggest that the vortex tubes vortex line a vortex tube which implies vortex line cannot a originate from cannot originate what are minute at any at internal points in a fluid.