Forget teacher, even scientist, Prof. Balakrishnan is a "Sage", as his personality, knowledge, teaching style , illuminating power to every corners of truth reveals him. He knows the "Truth", it looks like that these are not formal classes but "The process of unfolding of truths, the pure theoritical knowledge". Call him "Reeshi Balakrishnan", and time will make people understand value of these lectures .

This man allows us to stand in awe of nature. He also allows us to appreciate the genius of man's unraveling of nature's secrets. Thank you Dr.

This is a delightful introduction to 4-vectors. The physics is not lost due to the mathematics as is quite often done in lectures on this topic. Beautifully done!

Rock solid concept building professor 😀

I would suggest lectures by R shankar (Yale University) for special theory of relativity then come back and have a look at this

An important correction: Although the g's being constant throughout the space implies a flat space, the g's not being constant (i.e. depending on the coordinate values) does not imply curvature. E.g. the g's are not constant in a flat space coordinatized using polar coordinates. To detect curvature you need the curvature tensor or its equivalent, which essentially tells you whether or not your metric coefficient matrix can be mapped to the flat space one. Obviously this is not a GR lecture so Prof didn't go into detail on this, but it is an important point to emphasize because it's often misunderstood at first.

Thank You Sir