Comparison theorems are proved for second order linear differential systems of the form
(
R
i
y
′
)
′
+
P
i
y
=
0
({R_i}y’)’ + {P_i}y = 0
, where
R
i
{R_i}
and
P
i
{P_i}
are continuous
n
×
n
n \times n
matrices and
R
i
{R_i}
is invertible,
i
=
1
,
2
i = 1,2
.