Are Conservation Laws Metaphysically Necessary

Are laws of nature necessary, and if so, are all laws of nature necessary in the same way? This question has played an important role in recent discussion of laws of nature. I argue that not all laws of nature are necessary in the same way: conservation laws are perhaps to be regarded as metaphysically necessary. This sheds light both on the modal character of conservation laws, and on the relationship between different varieties of necessity. Forthcoming in Philosophy of Science (pdf)

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