Is it possible to work with a free algebra over an infinite alphabet ? Or to define an Infinite ring of **non-commutative** polynomials ?
I need one of these structures to work with the quasi shuffle product.

1 | initial version |

Is it possible to work with a free algebra over an infinite alphabet ? Or to define an Infinite ring of **non-commutative** polynomials ?
I need one of these structures to work with the quasi shuffle product.

2 | retagged |

Is it possible to work with a free algebra over an infinite alphabet ? Or to define an Infinite ring of **non-commutative** polynomials ?
I need one of these structures to work with the quasi shuffle product.

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