<s>
Dirac	B-Application
(	O
named	O
after	O
Paul	O
Dirac	B-Application
;	O
own	O
notation	O
DIRAC	B-Application
)	O
is	O
a	O
relativistic	O
ab	O
initio	O
quantum	O
chemistry	O
program	O
.	O
</s>
<s>
The	O
full	O
name	O
is	O
Program	O
for	O
Atomic	O
and	O
Molecular	O
Direct	O
Iterative	O
Relativistic	O
All-electron	O
Calculations	O
,	O
in	O
short	O
PAM	O
DIRAC	B-Application
.	O
</s>
<s>
Dirac	B-Application
is	O
one	O
of	O
the	O
most	O
successful	O
general-purpose	O
quantum	O
chemistry	O
packages	O
that	O
provides	O
accurate	O
description	O
of	O
relativistic	O
effects	O
in	O
molecules	O
,	O
using	O
the	O
Dirac	B-Application
equation	O
as	O
its	O
starting	O
point	O
.	O
</s>
