my coding is below…

set f / bf, ac, sa, ca, tr, ra / ***these elements is actually imported from excel file.

s / 1, 2, 3, 4,/

p / a, b, c, d, e, f… / ***these elements is actually imported from excel file

f_m(f) / bf sa ca / *****these elements is also imported from excel file.

parameters grade(p) / a 2 b 2 c 10 d 15 e 15 f 16 g 10… / *** these elements is actually imported from excel file

…

Binary variables

X(f,s,p) ****if selected 1, otherwise 0

equations

eq6(f,s)

eq7(f,s)

…

eq6(f,s)…

SUM((p), X(f,s,p)) =l= 10

eq7(f,s,p)$f_m(f)… *******

X(f,“1”,p)*grade(p) X(f,“2”,p)*grade(p) *****Q(1) **here, is my question.

…

AboutQ(1)…

I would like to represent “not equal” as on equation.

but, error occured about . maybe, I think gams doesn’t recognize symbol over equation.

I have to represent equation that LHS value must be not equal to RHS value like above described eq7.

How can I represent that ?

Any solution?

Best regards…

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