Shy,
We have seen it typed both ways here, with an "i" and with "I". We know what is intended no matter which way it is typed.
The question remains.
What is the 139 Vmini of 50 Knots predicated upon? How was it determined?
JimL gave a perfect CAA type response (yet again) that is factually correct but does not answer the question.
You begin to provide a better answer but still no Cigar.