Is Transitivity Applicable in Proving Subset Relations Among Sets A, B, and C?

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SUMMARY

The discussion centers on proving the transitive property of subset relations among sets A, B, and C. It establishes that if A is a subset of B and B is a subset of C, then A is definitively a subset of C. The proof begins with the assumption that if an element x belongs to set A, it must also belong to set B, and consequently to set C, thereby confirming the transitive relation.

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adriang
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Hello I'm having problems with actually proving this with some mathematics.
Let A, B, C be sets. Prove that if A is a subset of B and B is a subset of C then A is a subset of C.
Thanks.
 
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hi adriang! :smile:

always start proofs of this sort with "if a is in A, …" :wink:
 
A \subseteq B means if x\in A then x\in B for all x\in A.
 

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