Doesn't Authentication logically imply Non-repudiation?

Published: 13/10/2019
Doesn't Authentication logically imply Non-repudiation?
Source: SECURITY.STACKEXCHANGE.COM

Let me get this straight: if its confirmed that Alice is the source of a message (authentication) --- than shouldn't she be unable to deny that the message is from her (non-repudiation) ? Is there an example where authentication happens without non-repudiation ?

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