I am stuck as to how to prove that strangeness is conserved in electromagnetic and strong interactions, while it is not conserved in weak interactions. I know that this can be shown by studying the terms of the standard model Lagrangian, but I have no idea as to how I should proceed.

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    $\begingroup$ Write down all vertices involving at least one strange quark and a gauge boson. $\endgroup$ – Cosmas Zachos Jun 13 at 0:07
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    $\begingroup$ Hint: which interactions change quark flavor? $\endgroup$ – probably_someone Jun 13 at 7:58

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