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Σ<br />
<br />
25 4 14 <br />
1 <br />
<br />
α A alpha<br />
β B beta<br />
γ Γ gamma<br />
ϵ epsilon ε<br />
Z ζ zeta<br />
H η eta<br />
Θ θ theta ϑ<br />
I ι iota<br />
K κ kappa<br />
Λ λ lambda<br />
M µ mu<br />
N ν nu<br />
Ξ ξ xi<br />
O o omicron <br />
Π π pi<br />
P ρ rho ϱ<br />
Σ σ sigma ς<br />
T τ tau<br />
Υ υ upsilon<br />
Φ ϕ phi φ<br />
X χ chi<br />
Φ pshi pshi<br />
Ω ω omega<br />
1
2 Σ<br />
x 1 , x 2 , . . . , x n <br />
n∑<br />
x i = x 1 + x 2 + · · · + x n<br />
i=1<br />
✓<br />
<br />
✏<br />
<br />
(1)<br />
(2)<br />
(3)<br />
n∑<br />
ax i = a<br />
i=1<br />
n∑<br />
i=1<br />
n∑<br />
(x i + y i ) =<br />
i=1<br />
n∑<br />
a = na<br />
i=1<br />
x i<br />
n∑<br />
x i +<br />
n∑<br />
i=1 i=1<br />
y i<br />
n∑<br />
n∑ n∑<br />
(ax i + by i + c) = a x i + b y i + nc<br />
i=1<br />
i=1 i=1<br />
<br />
✒<br />
<br />
✑<br />
(1)<br />
n∑<br />
ax i = ax 1 + ax 2 + · · · + ax n<br />
i=1<br />
= a(x 1 + x 2 + · · · + x n )<br />
n∑<br />
= a x i .<br />
i=1<br />
(2)<br />
n∑<br />
(x i + y i ) = (x 1 + y 1 ) + (x 2 + y 2 ) + · · · + (x n + y n )<br />
i=1<br />
n∑ n∑<br />
= (x 1 + · · · + x n ) + (y 1 + · · · + y n ) = x i + y i .<br />
i=1 i=1<br />
(3)<br />
n<br />
n∑ { }} {<br />
a = a + a + · · · + a = a<br />
i=1<br />
n∑<br />
1 = na.<br />
i=1<br />
2