<s>
In	O
atmospheric	O
radiation	O
,	O
Chandrasekhar	B-Algorithm
's	I-Algorithm
X	I-Algorithm
-	I-Algorithm
and	I-Algorithm
Y-function	I-Algorithm
appears	O
as	O
the	O
solutions	O
of	O
problems	O
involving	O
diffusive	O
reflection	O
and	O
transmission	O
,	O
introduced	O
by	O
the	O
Indian	O
American	O
astrophysicist	O
Subrahmanyan	O
Chandrasekhar	O
.	O
</s>
