A group G acts faithfully on a set S if g * s = s for all s € S implies g = e. Show that G acts faithfully on S if and only if ma ‡ mg for all g, g' e G distinct.

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mg is a "multiplication by g" map such that

mg : S -> S

mg(s) = gㅁs

A group G acts faithfully on a set S if g * s = s for all s € S implies g = e. Show that G acts faithfully
on S if and only if mg ‡ mg for all g, g′ € G distinct.
Transcribed Image Text:A group G acts faithfully on a set S if g * s = s for all s € S implies g = e. Show that G acts faithfully on S if and only if mg ‡ mg for all g, g′ € G distinct.
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