What are the advantages and limitations associated with using Gann's Square of Nine in trading? gon Well-Known Member Oct 2, 2023 #2 It reminds me the popular Testla's vortex maths theories that are false, totally false and randomly choosen numbers (6, 9, 3..). Anyways, I am a really skeptical person that thinks that everything is false unless proven otherwise scientifically. Other false techniques that make use of circular domains are astrological trading and quantum trading. I put them'all in the same bucket (a dirty one) as Vortex maths. I have verified it by real mathematicians colleagues, not only my analysis anyways. It is just my opinion, I may be wrong. In trading, many things that seem initially invalid can prove worth a test.