In fact I didn't daydream , this IS of course false.

is(a[1] = a__1);
                             false

End of transmission :)

Jean-Michel

Got it ! :)

look closely :

a[1] = a__1;
                          a[1] = a__1

well look closely to the one line worksheet  I attach here : the '1' are not displayed 

exacltly the same way. but on MaplePrimes they look the same.

Download 1.mw

Thank you very much Acer...quite understandable.

that's certainly why I never used __ in my programs in the past.

However :

a[1] := x + y;
                         a[1] := x + y

a__1 := y+x;
                         a__1 := x + y

is(a[1] = a__1);
                              true

x[2] := a;
                           x[2] := a

x__2 := a;
                           x__2 := a

is(x[2] = x__2);
                              true

So I apologize to everyone but I can't even remember when I saw "False" !

I must have been daydreaming ...

good evening,

Jean-Michel

Thank you Edgardo...this does help.

I do have full access to this file version.txt (in the un*x world mode 0755).

for me it has been a recurrent problem.

Kind regards,

Jean-Michel

@nm 

Thank you so much..It did the trick :)

I only restarted the kernel not Maple.

Jean-Michel

PS : I DO appreciate people who reply even to seemingly stupid questions.

@mmcdara 

thankx a lot.

The new UI (which is a wonder) was too small for me to see 'options'.

I found and everything is OK.

Best,

Jean-Michel

Thank you Edgardo to you and your team of developers for this Physics package.

It is THE one package needed by any serious theoretical physicist and the best package I ever see for any *scientific* software.

Keep the great job on the trails.

Jean-Michel Paris retired mathematician

Hello,

Thank you very much !

Indeed these reples were very useful.

Kind regards,

Jean-Michel

thank you , it does help.

kind regards