I argue below for the view that non-moral truths entail moral ones. I first argue that moral claims do have truth values which are objectively true or false. I then argue that this objectivism does not entail non-relativism. I produce a simple possible worlds argument for the entailment view. I then give some examples where p entails q but many intelligent people have thought it does not, and where it does not, but many intelligent people have thought that it does. I also try to evaluate a somewhat neglected argument by Hume. In the final section, I further consider some moral and meta-moral opinions.

中文翻译：

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为什么“是”必须包含“应该”

我在下面论证非道德真理必然包含道德真理的观点。我首先论证道德主张确实具有客观真值或假值。然后我争辩说，这种客观主义并不意味着非相对主义。我为蕴涵观点提出了一个简单的可能世界论证。然后我给出一些例子，其中 p 包含 q 但许多聪明人认为它不包含，以及它不包含但许多聪明人认为它包含的地方。我还试图评估休谟有点被忽视的论点。在最后一节中，我进一步考虑了一些道德和超道德观点。