QUES: In the case that your RDD file doesnt open it is highly likely that you do not have the correct software application installed on your PC to view or edit RDD file extensions

correct the punctuation.

CORRECTED: In the case that your RDD file doesn't open, it is highly likely that you do not have the correct software application installed on your PC to view or edit RDD file extensions.

QUES: The collected poetical work of Sren Poulsen Judichr

correct the punctuation.

CORRECTED: The collected poetical work of Sren Poulsen Judichr

QUES: He used to hold a general course of mathematics and a threeyear cycle of lectures on differential equations the theory of analytic functions and algebra including number theory

correct the punctuation.

CORRECTED:
He used to hold a general course of mathematics and a three-year cycle of lectures on differential equations, the theory of analytic functions, and algebra including number theory.