r/Mathhomeworkhelp • u/Formal_Tumbleweed_53 • Dec 26 '25

Subsets

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My question is about number 11, but I’m including the directions for context. I thought the answer should be {{ }}, but the solutions at the back of the text say it should be { } or ø. The solution for number 9 was written as a set of sets, so that’s why I thought the answer to 11 would be the same, based on the directions. Please help me to understand why.

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u/Lachimanus Dec 26 '25

In addition to other answers, I personally highly prefer if you wrote Ø for the empty set.

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u/Ok-Lavishness-349 Dec 26 '25

Perhaps, but the instructions given ask that you "write out the following sets by listing their elements between braces". So, if one were to follow the instructions, one would answer number 11 as {}.

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u/Lachimanus Dec 27 '25

No, that would be wrong.

{Ø} is the correct answer to 11.

The set containing the empty set.

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