## Why $\mathcal{O}(n^2)$ multiplication of coefficient required for canonical form of polynomial?

I was going to a textbook and am not able to understand the following:

Let $$F(x)$$ is given as a product $$F(x) = \sum_{i=0}^{n} (x – a_i)$$. Transforming $$F(x)$$ to its canonical form by consecutively multiplying the $$i$$th monomial with the product of the first $$i-1$$ monomials requires $$\mathcal{O}(n^2)$$ multiplications of coefficients.

A canonical form of polynomial is $$\sum_{i=0}^{n} c_i x_i$$.

Why $$\mathcal{O}(n^2)$$?

## http to https redirect triggers “Duplicate without user-selected canonical”

For some reason, my Main URL (https://www.foxteller.com) cannot be indexed because of my domain redirects in the apache2 config.

My redirects go as follows:

• http://foxteller.com/ > https://www.foxteller.com/
• http://foxtellers.com/ > https://www.foxteller.com/
• http://fox-teller.com/ > https://www.foxteller.com/

The following error appears when I try to inspect my URL on the webmaster tools:
Duplicate without user-selected canonical

I understand Canonical tags are used to define duplicate pages. But I never knew it could be used in an apache redirect. At least according to Google, it can. But in this case, I don’t understand why it is during an Apache2 Redirect. No page is being generated during the redirect as it is a 301 redirect. So I cannot use a Canonical tag.

I also asked this question in the Google products forums but sadly these “Experts” apparently do not seem to know a lot regarding canonical changes Google made in October 2018.

This is my Apache2 Config for the HTTP redirect:

<VirtualHost *:80>   ServerAdmin webmaster@foxteller.com   ServerName foxteller.com   ServerAlias fox-teller.com foxtellers.com   ServerAlias *.foxteller.com *.fox-teller.com *.foxtellers.com    RedirectMatch 301 ^(.*)\$   https://www.foxteller.com </VirtualHost> 

Please do note that the page is indexed on google. But the metadata you see on there is about 2-3 months old and it cannot be refreshed due to this error.

The page is completely unable to index the updated page due to this.

## Semi-ampleness if log canonical pair during the process of log minimal model program

Suppose we have a log canonical pair (X, D) and K_X+D is Q-Cartier Q divisor. If this divisor is not bef, by cone theorem for log canonical pairs, we can do the contraction of extremal rays. And sometimes we can get a flip construction and thus get a log flip Y. K_Y+E is the strict transform of K_X+D. My question is that is semi-ampleness of pair preserved during flip? If not, for what kind of pair on X, its semi-ampleness can be preserved.

## Canonical web page layout articles

I need scientific works or articles about canonical layout forms used in e-commerce shops, something about prototyping and trying them on a real audience. Maybe can you lead me were I can found something like this information, or maybe you now that about the new names for this structure?

I found this example but it’s old one:

I doing a research work on this but I can’t find any information, so I hope somebody will lead me the right way!

Thant you!

## Need the code to fix canonical issue

Hello

I am using wordpress and using Yoast SEO plugins. I want to fix my canonical issue using tool option of yoast. But I have not the code. I have already seen some video, but they have not provided the code on their video description. So I am on stack. Would you please give me the code to use?

## Canonical way to get static asset version

I can write a function easily enough to file_get_contents('pub/static/deployed_version.txt'), but I’m curious, is there an M2 class that provides this behavior already?

## Domain Access Source – Canonical

for now domain access and source set the correct canonical domain and show the links linked to the correct page.

I can disable that and the links stay within the domain I’m currently on. Visitors won’t get redirected to a “new” page.

I’ve got two domains. Site A and site B. A has content from B but visitors from A should particularly know that there is site B except they land on B by Google search or wise versa. But there is content from B that has to appear on A. Without the penalty of double content, which it is right now.

How can I leave the links alone but set the canonical to the real source? D7 had that ability with tokens, D8 doesn’t because “it’s working as intended”

## Does Google considers the direct traffic on the pages with rel canonical tags?

Hi community,

Let’s say there is a duplicate page (A) pointing to original page (B) using rel canonical tag. Pagerank will be passed from Page A to B as the content is very similar and Google honours it hopefully. I wonder how Google treats the direct traffic on the duplicate Page A. We know that direct traffic is also an important ranking factor (correct me if I’m wrong). If the direct traffic is high on the duplicate page A, then how Google considers it? Will there be any score given to original page B?

Thanks

## Would too many canonical backlinks can harm your website?

I have thousands of cross domain canonical backlinks pointing to my website. Would too many canonical tag backlinks can harm your website in any way?