<s>
Nonstandard	B-Algorithm
finite	I-Algorithm
difference	I-Algorithm
schemes	I-Algorithm
is	O
a	O
general	O
set	O
of	O
methods	O
in	O
numerical	B-General_Concept
analysis	I-General_Concept
that	O
gives	O
numerical	B-General_Concept
solutions	I-General_Concept
to	O
differential	O
equations	O
by	O
constructing	O
a	O
discrete	O
model	O
.	O
</s>
