15. According to the third approach to establishing the greatest common divisor theory in , (i) establish the corresponding greatest common divisor theory in (equality in the conclusions is meant in the sense of associates); (ii) establish the corresponding greatest common divisor theory in (equality in the conclusions is meant in the sense of associates). Compare the differences between these two theories.
Solution
None
Translate the text above into English, please retain the original text's line breaks and format, and output the translation result directly.
Note: The provided instruction is a meta-instruction and not part of the text to be translated. Since the text to be translated is "None", the translation is also "None". Here is the formatted output as requested:
None
Want a route through all this instead of an archive? The track
puts 2,000 problems in a working order, from AMC 10 level to the IMO shortlist.