English: Time derivative of Ex, I am talking about this guy over here and what are the values being subtracted?H (i /2, /2) , that is this guy over here and that is this guy over z + 1 j + 1 H (i /2, /2) z + 1 j − 1 here right.
Telugu: H (i /2, /2) , ఇక్కడ ఉన్న ఈ వ్యక్తి మరియు z + 1 j + 1 H కంటే ఈ టర్మ్ (i /2, /2) z + 1 j - 1 ఇక్కడే.