“下跌凭自重，上升靠推力”的动力学表达

Group 1 - The core principle of the article is that in the stock market, declines happen due to inherent weight, while rises require external push to overcome that weight [1] - SSV and RSL are two long-term momentum indicators; SSV measures inherent momentum, while RSL compares inherent momentum with external push [2] - In a long-term downward trend, SSV is sufficient, but once transitioning to an upward phase, both RSL and SSV should resonate upwards [3] Group 2 - The condition SSV>0 AND RSL>0 defines the core logic of long-term trend background [3] - RSL can show positive values even in a downward trend if the decline is slower, which may lead to false signals [7] - During an upward trend, RSL consistently shows negative values for slower gainers, effectively filtering out underperforming stocks [8] Group 3 - Both declines and rises exhibit a Matthew effect; declines accelerate due to inherent weight, while rises require sufficient external push to gain momentum [9] - The article emphasizes the importance of understanding the underlying logic and differences between SSV and RSL, recommending "Laughing at Bulls and Bears" as a foundational text for trend speculation [10]