Say we have two finite sequences X=(x0,...,xn) and Y=(y0,...,yn).

Is there a more or less common notation for the concatenation of these sequences, like ∑(X,Y)=(x0,...,xn,y0,...,yn)?

**Answer**

The comments suggest the following notations for the concatenation of X and Y:

- X⌢Y (given by
`X^\frown Y`

); - XY (given by
`XY`

); - X⋅Y (given by
`X \cdot Y`

); - X‖ (given by
`X \mathbin\Vert Y`

);

of which the first seems not to be in use for other concepts, making it especially suitable.

**Attribution***Source : Link , Question Author : chtenb , Answer Author :
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