# Download PDF by Colm T. Whelan: A first course in mathematical physics

By Colm T. Whelan

The ebook assumes subsequent to no earlier wisdom of the subject. the 1st half introduces the center arithmetic, regularly along side the actual context. within the moment a part of the publication, a sequence of examples showcases the various extra conceptually complicated parts of physics, the presentation of which attracts at the advancements within the first half. plenty of difficulties is helping scholars to hone their talents in utilizing the provided mathematical tools. strategies to the issues can be found to teachers on an linked password-protected site for teachers.

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**Example text**

If ???? is negative, then we have a decreasing population, for example, radioactive nuclei that decay probabilistically. 4. Radioactive Decay. 53) ???????? N(t) being the number of atoms at time t, ???? is known as the decay constant and is characteristic of a given species. 53) states that the rate of decay is proportional to the number of radioactive nuclei present. Let N0 be the number present at time t = 0. 4 Plot of N(t) = 10e????t . ???? = +1, solid line; ???? = −1, dashed line. is the solution. 4). 5).

66) c2 (x) + s2 (x) = 1 f 2 (x) + g 2 (x) = 1 The functions F1 (x) = f (x)c(x) − s(x)g(x) F2 (x) = f (x)s(x) + c(x)g(x) are such that dF1 (x) dF2 (x) = =0 ???????? ???????? Hence a = f (x)c(x) − s(x)g(x) b = f (x)s(x) + c(x)g(x) where a and b are constants. Substituting the values at x = 0 yields 0 = f (x)c(x) − s(x)g(x) 1 = f (x)s(x) + c(x)g(x) Hence 0 = f (x)c2 (x) − c(x)s(x)g(x) s(x) = f (x)s2 (x) + s(x)c(x)g(x) Adding the last two lines yields s(x) = f (x) Hence s′ (x) = f ′ (x) Hence c(x) = g(x) ◾ Clearly, the functions c(x), s(x) have all the properties of the sin(x) and cos(x) of trigonometry.

5. ln (????????) = ln x + ln a. 5 Plot of y = ln x. Proof: Consider F(x) = ln(????????) − ln(x) d ln(????????) ???????????? d ln(x) − d(????????) ???????? ???????? 1 1 = a− ???????? x =0 F ′ (x) = Thus, F(x) = c, where c is constant. Now take x = 1 and we have F(1) = ln(a) = c. 5. ln(xn ) = n ln x Proof: Clearly true for n = 1, assume to be true for n = N, that is, assume ln xN = N ln x. ln(xN+1 ) = ln(x(xN )) = ln x + ln xN = ln x + N ln x = (N + 1) ln x Thus, by principle of induction, true for all N. 56) that as x → ∞ ln( 1x ) → −∞.