6. Greek Alphabet
A, a—alpha
I, t—iota
P, p—rho
B, n—beta
K, x—kappa
I, a—sigma
I', y—gamma
A, 2,.—lambda
T, r—tau
A, 6—delta
M, p,—mu
1", v—upsilon
E, e—epsilon
N, v—nu
al, 11)— phi
Z, c— zeta
E, —xi
X, x—chi
H, s —eta
0, o—omicron
IV, 1p — psi
0, 0— theta
H, it—pi
52, co—omega
7. Numerical Constants and Approximations
Numerical constants
Approximate formulas (for cc << 1)
21=3.1416
(1 ± cOn .,-.-. 1 ± n a
n2 =9.8696
er-:-...,1-1-a
lin=1.7725
In (1+a) 7:- .- .. a
e= 2.7183
sin a - -:.-... a
log e = 0.4343
cos a ...-. 1— a2/2
In 10=2.3026
tan a ,-----, a
8. Some Data on Vectors
a(b+e)=ab-l-ac
[a, b±c]--=[abl+[ac]
ab=a ibx -Fayby +azbz
[a [bell =b (ac)— c (ab)
i j k
ax ay a t =(aybz —azby)i+(az bx —a xbz)i+ (axby — aybx) k
b x by b z
dt (a+b)
da
db
=
d
d a
da
a)= -it-a±ce dt
d
is‘
da
db
dt
dt "ma dt
d
r r da i,
11 r db
La"1= L dt 1 L a dt j
[ab] =