This item should be useful for my students and colleagues. I found a very nice way to get my doubts on maths cleared. I discovered a bunch of maths teachers, ready to help, at :
Of course, you must get registered, to post to this forum. You can read the questions/queris and the aswers, without registering. Nice way to discover and learn maths.
Try this (and let me know).
PS: I found a peculiar enigma in the title of this blog entry. Who is invisible ? maths teachers, or maths ?