Lec_01, Number Theory, Definition of divisibility and some results. (Urdu/Hindi).

** Remember that if a divides b and b=ac then c also divides b provided c is non-zero. Table of Contents. 00:10 Definition of Divisibility. 07:10 If a divides b then by definition a is non zero. 10:14 Theorem (i) a divides 0 12:12 Theorem (ii) 1 divides a and -1 divides a 14:10 Theorem (iii) a divides a 15:04 Theorem (iv) If a divides b and b divides a then a is equal to plus minus b 22:43 Theorem (v) if a divides b and b divides c then a divides c 26:02 Theorem (vi) If a divides b then a divides bc 27:46 Theorem (vii) If a divides b then ac divides bc 29:59 Theorem (viii) If a divides b and a divides c then a divides bx+cy for all x and y in Z. In this lecture series "Number Theory" Mr. Javed Ali will cover the syllabus of B.Sc. two year b-course of mathematics, ADP program, BS mathematics and M.Sc. mathematics. We shall be thankful to all those, who will comment and message us on our channels whatsapp number (092)03154414993.