## Rotations – Anchoring matrices in the linear equation system for uniqueness

This book "Articulated Motion and Deformable Objects: 7th International Conference" (1) describes how a unique (non-zero) solution to this homogeneous system of linear equations arises $$MR = [… -I … R_{ij} …][… R_i … R_j]^ T = 0$$ for relative rotation decoding (where $$j = 1.2.3$$). This equation is derived from the relationships between relative rotations and absolute rotations $$R_ {i, j} = R_iR_j$$ reformulated to $$R_ {i, j} R_i – R_j = 0$$,

Thus, it can be solved by anchoring one or more rotation matrices in the least square sense $$R_i$$ Guarantee uniqueness: $$M ^ TM + lambda I_k = M ^ TR_i + lambda ^ 2 cdot R_k$$However, I do not understand where the parameter is $$lambda$$ comes out and how to get it and what is meant by "solution in the least square sense".

Any help is greatly appreciated!

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## html – Best element for easy anchoring to avoid possible SEO penalties because the content and purpose of the element is missing

### First, an introduction, why the element is necessary

I have to balance a fixed top navigation bar in my anchors. For example, if I let my users navigate to a section like `#Remarks` To display comments below a news article, the first 60 pixels of it are covered by the fixed header of the page.

In the search for compensation I have found recommendations to use a special element for this purpose, for example a and then style it with CSS to compensate for the top offset in this way:

``````on[name] {
Top edge: -60px;
}
``````

This works fine, it moves the item up, but the content down, leaving the browser anchored `60px` As soon as the content starts, there is only enough room for navigation. This solves the technical problem.

### question

My concern here is, search engines will penalize the site's ranking for being empty Elements that lead nowhere? semantic is a link, but it does not link anywhere and would probably cause as many problems as the Infame ,

I would solve the problem completely by including one `rel = "noindex"` to or even `rel = "noindex, nofollow"`?

What is the best setup from the SEO point of view?