im searching for the philosophical proof of the next statement (according to my text the source is from frege):(adsbygoogle = window.adsbygoogle || []).push({});

if:

1)propsitons aren't complex singular terms (definite descriptions) and they are domain indicators for definite descriptions.

2)for equivalent singular terms there's the same domain indicator.

3) a singular term doesnt change its indicator. if a singular term is contained in/substituted by another with the same indicator;

then:

4) for all the propsitions with the same truth value there's the same indicator.

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# Frege proof.

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