Is S7 x {0} a Maximal Normal Subgroup of S7 x Z7?

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The discussion centers on whether S7 x {0} is a maximal normal subgroup of the group S7 x Z7. Participants inquire about the normality of S7 x {0} within S7 x Z7 and whether there are any intermediate subgroups G that fit between S7 x {0} and S7 x Z7. They explore the existence of such subgroups and their potential normality. The conversation emphasizes the need for clarity on these subgroup relationships and their properties. Understanding these concepts is crucial for determining the structure of the group involved.
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1. Is the group S7 X {0} a maximal normal subgroup of the product group S7 X Z7 ?



2. No relevant equations



3. That kinda is my answer, original question was asking about S7 X Z7
 
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How far have you got so far? What are your answers to the following questions?

1) Is S_7 \times \{0\} a normal subgroup of S_7 \times Z_7?

2) Are there any subgroups G such that S_7 \times \{0\} < G < S_7 \times Z_7?

3) If yes to 2), are any of the subgroups G normal?
 
Question: A clock's minute hand has length 4 and its hour hand has length 3. What is the distance between the tips at the moment when it is increasing most rapidly?(Putnam Exam Question) Answer: Making assumption that both the hands moves at constant angular velocities, the answer is ## \sqrt{7} .## But don't you think this assumption is somewhat doubtful and wrong?

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