I hope it is not too absurd. I must ask for some help...

I have a very general question. What is the meaning of the following mathematical expressions?

1)

2)

3)

About the first and the second expression, I have a guess... I think these expressions are just another notation for:

But I am not sure at all, it's just my guess....

About the third expression... I think it notates that both

I would highly appreciate every comment on the topic...

Have a nice day!:spin:

I have a very general question. What is the meaning of the following mathematical expressions?

1)

**q=1, M**2)

**i=1, N**3)

**m, M=0**About the first and the second expression, I have a guess... I think these expressions are just another notation for:

**q=1...M**and**i=q...N**But I am not sure at all, it's just my guess....

About the third expression... I think it notates that both

**m**and**M**are equal to zero. But again, I am not sure whether this is the right meaning and expression.I would highly appreciate every comment on the topic...

Have a nice day!:spin:

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