Thanks. ***...*** seems to mean the same as ***..*** in Bash, e.g.
```
for i in {1..5}; do echo "$i"; done
```

it's x1 to xn, so "n" is the number of things and "..." is everything in between

it's a commonly used notation

03365d6a53

Blind Signatures For Untraceable Payments

Conservation of signatures--provider can create at most one stripped signature for each thing signed by signer (i.e. even with s'(c(x1)) ... s'(c(xn)) and choice of c, c', and xi,
it is impractical to produce s'(y) such that r(y) and y≠xi).

I get it from the context that the passage is about the impracticality of producing
two private keys of the same value within a reasonable amount of time.
But I want to be sure that I understand Chaum correctly, hence 

 equivalent to some other more commonly used notation?

[1]: https://sceweb.sce.uhcl.edu/yang/teaching/csci5234WebSecurityFall2011/Chaum-blind-signatures.PDF

[2]: https://math.stackexchange.com/search?q=%22...%22

ecash

What does '...' notation mean in *[Blind Signatures For Untraceable Payments][1]* of David Chaum

On the page 4 of *Blind Signatures For Untraceable Payments* it is written:

>Conservation of signatures--provider can create at most one stripped signature for each thing signed by signer (i.e. even with s'(c(x1)) ... s'(c(xn)) and choice of c, c', and xi, 
it is impractical to produce s'(y) such that r(y) and y≠xi).

I get it from the context that the passage is about the impracticality of producing 
two private keys of the same value within a reasonable amount of time.
But I want to be sure that I understand Chaum correctly, hence [I would
like to know what][2] ***...*** means in his formula. 
Is ***...*** equivalent to some other more commonly used notation?



[1]: https://sceweb.sce.uhcl.edu/yang/teaching/csci5234WebSecurityFall2011/Chaum-blind-signatures.PDF
[2]: https://math.stackexchange.com/search?q=%22...%22