Method Rejection theorem (Barseghyan-2015)

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This is an answer to the question Mechanism of Method Rejection that states "A method ceases to be employed only when other methods that are incompatible with the method become employed."


Method Rejection theorem was formulated by Hakob Barseghyan in 2015.1 It is currently accepted by Scientonomy community as the best available answer to the question.

Scientonomic History

Initially, the method rejection theorem was accepted as deducible from the conjunction of the first law for methods and Harder's zeroth law.


After the replacement of Harder's zeroth law with the compatibility corollary, suggested by Fraser and Sarwar, it became accepted that the method rejection theorem is a deductive consequence of the first law for theories and the compatibility corollary.2pp. 72-74

Acceptance Record

Here is the complete acceptance record of this theory:
CommunityAccepted FromAcceptance IndicatorsStill AcceptedAccepted UntilRejection Indicators
Scientonomy1 January 2016The theorem became de facto accepted by the community at that time together with the whole theory of scientific change.Yes

Question Answered

Method Rejection theorem (Barseghyan-2015) is an attempt to theory the following question: When does an employed method become rejected?

See Mechanism of Method Rejection for more details.


According to the method rejection theorem, a method ceases to be employed only when other methods that are incompatible with it become employed. By the first law for methods, an employed method will remain employed until it is replaced by other methods. By the compatibility corollary, the elements of the scientific mosaic are compatible with each other at any moment of time. Thus, a method can only become rejected when it is replaced by an incompatible method or methods.1pp. 172-176 2pp. 72-74

Method Rejection Theorem deduction (Barseghyan-Fraser-Sarwar-2018).png


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  1. a b  Barseghyan, Hakob. (2015) The Laws of Scientific Change. Springer.
  2. a b  Fraser, Patrick and Sarwar, Ameer. (2018) A Compatibility Law and the Classification of Theory Change. Scientonomy 2, 67-82. Retrieved from