Hi..(adsbygoogle = window.adsbygoogle || []).push({});

In the second paragraph of the following paper, there is a statement: "Because the direct product of subgroups is automatically a subgroup.."

http://jmp.aip.org/jmapaq/v23/i10/p1747_s1?bypassSSO=1 [Broken]

I don't see how that can be true...you can always take direct product of a subgroup with itself many times and create a group of order larger than the parent group...

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Is direct product of subgroups a subgroup?

**Physics Forums | Science Articles, Homework Help, Discussion**