Fix latex printing of ProductSet when exponent has more than one digit

[jlumpe]

Printing of ProductSet does not enclose exponent in braces, so digits after the first are not printed correctly. Fixed this and added a test for it.

• printing
  • Fix latex printing of ProductSet when exponent has more than one digit

[sympy-bot]

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• printing
  • Fix latex printing of ProductSet when exponent has more than one digit (#15456 by @jlumpe)

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Printing of `ProductSet` does not enclose exponent in braces, so digits after the first are not printed correctly. Fixed this and added a test for it.

<!-- BEGIN RELEASE NOTES -->
* printing
   * Fix latex printing of ProductSet when exponent has more than one digit
<!-- END RELEASE NOTES -->

Update

The release notes on the wiki have been updated.

[bjodah]

Thanks!