9 years, 92 days

## thanks，how to avoid it...

@dharr thanks,yes,i know the exact answer, but how to  avoid the problem caused by interval if  no warning message was given.

@vv thanks a lot

## thanks，just it...

@Preben Alsholm thanks a lot

## i mean how i can distinguish between a__...

@ThU for indexed subscripts,i can use indets(poly,'specindex(anything,a)') to acquire a[b], and use "select(has, poly,a[b])" to reach the results,but now,i meet  literal subscripts rather than indexed subscripts,how do i?

## thanks,but i'm afraid you wrote wrong...

thanks a lot ,i find you wrote p[2] rather than p2.

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 (5)

From PDE2,we can see p2 different from p[2],i guess the result should be symmetry rather than Eq.(5)

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## how i know SolveEquations can solve...

### hi，please see my attachment，i slove the equations using DirectSearch v.2,for some parameters ,it can work well,but when i choose some ones,it has been running so a great deal of time(one day and one night) that i'm not even sure solves exists.but once in a while,solves can be found,why? thanks  a lot.

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## i do it,but another wrong happend "Error...

try

g:= proc()

solve(eq);

end proc:

sols:=[timelimit(300, g())];

catch "Error, (in fsolve/polyill) time expired" :
sols:=SolveEquations(eq);

end try;
in my opinion,"Error, (in fsolve/polyill) time expired",the program still may run,but i meet the program stop after the messege.

## why SolveEquations show diffrent solutio...

@Markiyan Hirnyk

eq:=[2*x-0.2e-1*y-2.04*sqrt(-v^2+1)*v, 2*y-0.2e-1*x-2.16*sqrt(-u^2+1)*u, 2*u+2.16*u^2*y/sqrt(-u^2+1)-2.16*sqrt(-u^2+1)*y, 2*v+2.04*v^2*x/sqrt(-v^2+1)-2.04*sqrt(-v^2+1)*x] ;

i do as follows using DirectSearch package v.2

i find the solutions not the same,some time the results not much difference,but another,sols1 have one solution,sols2 have three solutions.in some time,some solutions are lost.may i have run the command serveral times? regards.

## thanks a lot...

thanks Edgardo very much，I appreciate your early reply.Provided by Edgardo ,it's right using Maple 17.01.

## thanks a lot...

thanks Edgardo very much，I appreciate your early reply.Provided by Edgardo ,it's right using Maple 17.01.

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