[Projjwal]

I am a user of Barnes & Noble nook simple touch.
I inserted my physics e books(pdf) into my reader from computer but the original font size was too low to be comfortable to read. I increased that and the problem occurred with the formulas as it was either misplaced or the special characters was omitted (for example h cross,psi). I used calibre also as it is such a wonderful tool but the problem remained...It might be happening because of my incapability to convert it in the right way...
please help sir....(from Projjwal Kanjilal, Kolkata)