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Question: evaluation of symbolic matrix multiplication

Question:evaluation of symbolic matrix multiplication

Amir Saman Mir 85 Maple
unevaluated physics
October 14 2022
1

Hey guys im using maple 2022 with last version of Physics package (version 2022) , I know my question might be stupid but in the following expression 

restart;
with(Physics[Vectors]);
Setup(mathematicalnotation = true);
with(Physics);
Setup(op = {I__b, I__s, Omega, `ω_`});
eval(I__b . (diff(`&omega;_`(t), t)), {I__b = <<I__1 | 0 | 0>, <0 | I__2 | 0>, <0 | 0 | I__3>>, `&omega;_`(t) = <omega[1](t), omega[2](t), omega[3](t)>})

I want to get the following as result

but I keep getting the unevaluated one as follows

What am I doing wrong here, 

thanks in advance

 

 

 
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