If you really want to know how to use relevance in your web content for any page on your website, and write content for your website that cannot be misconstrued, you have to open your eyes and look at what you are writing. I have read so much hysterical tripe online, even on the first page of Google from reasonably respected websites, that I despair for the intelligence of many people.
Given that their sites are not at #1 – #5 due to a lack of ability or intelligence, then I also despair for their honesty. Who really cares about complex mathematical equations? This big term Latent Semantic Indexing, or LSI for short, is a meaningless term for webmasters and they should not even be bothering with it, let alone contemplating teaching you about it.
I have a page on my website telling you what it is not! Perhaps more people should read that. In fact, the Google algorithm contains an element of Latent Semantic Analysis, there is no such a term as LSI, and you certainly cant make your website LSI compliant, since that term indicates a total ignorance in what it actually is. Any statistical mathematician can tell you that! Its pretty basic.
Heres a heads up...