What Is Non Canonical Url?


What Is Seo Canonical Link..?

What is a canonical tag? A canonical tag (aka “rel canonical”) is a way of telling search engines that a specific URL represents the master copy of a page. Using the canonical tag prevents problems caused by identical or “duplicate” content appearing on multiple URLs.

What Is Seo Canonical Link..?

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 I Want To Know that What Is Seo Canonical Link..?


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Hreflang conflicts with canonical in source code

A report in SEMRush has flagged an issue with hreflang conflicting with rel=canonical but I’m not sure how to resolve the issue or get to the bottom of it. Has anyone else experienced this and can you shed any light on this?

seo – How to fix duplicate title tags canonical for / vs index.html

I am confused, after scanning by an online SEO tool, it says:

error duplicate title tags canonical; https://cleanmypc.co.uk and https://cleanmypc.co.uk/index.html

I have in my .htaccess file

RewriteEngine on
RewriteCond %{HTTP_HOST} ^www.cleanmypc.co.uk$
RewriteRule ^/?$ "https://cleanmypc.co.uk/" [R=301,L] 

and on my web page https://cleanmypc.co.uk/index.html I have <link rel="canonical" href="https://cleanmypc.co.uk/index.html/" />

Where am I going wrong?

seo – How crawler decides which one is original if use the canonical tag (self reference) on each version of the duplicate content or page?

To understand the query, let’s take two sites

  1. https://www.abc.example/a
  2. https://www.xyz.example/a

https://www.abc.example/a is an already existing site (it is already self canonicalize <link href="https://www.abc.example/a">) and https://www.xyz.example/a is a newly created site by me. I took the content from https://www.abc.example/a and put self canonicalization <link href="https://www.xyz.example/a">.

So here my questions arrives that

  • Which content is original content and which is duplicate?
  • Which content will get more preference in the Google index?

software installation – unable to install from canonical partners after update

I had ubuntu LTS and decided to upgrade to the normal version. after than I’m unable to install anything that requires canonical partners. I can select the option in software source, but I’m still unable to install. when I try to update this is what I get:

~$ sudo apt update
Hit:1 http://archive.ubuntu.com/ubuntu groovy InRelease
Hit:2 http://archive.canonical.com groovy InRelease
Hit:3 http://archive.ubuntu.com/ubuntu groovy-updates InRelease
Hit:4 http://archive.ubuntu.com/ubuntu groovy-backports InRelease
Get:5 http://archive.canonical.com/ubuntu maverick InRelease (6,170 B)
Get:6 http://archive.ubuntu.com/ubuntu groovy-security InRelease (108 kB)
Err:5 http://archive.canonical.com/ubuntu maverick InRelease
The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5
Reading package lists… Done
W: GPG error: http://archive.canonical.com/ubuntu maverick InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5
E: The repository ‘http://archive.canonical.com/ubuntu maverick InRelease’ is not signed.
N: Updating from such a repository can’t be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

The last thing I tried was install the snap-store base on something i read online. It didn’t change a thing.
At this point I’m thinking in downloading and installing clean from a USB but I’d prefer not to. any sugestions?

Is it true that a projective Kähler manifold of general type has a smooth canonical model and has no singular fibers?

A projective Kahler manifold $X$ of general type is a manifold which is projective and whose canonical bundle is big and nef. Let $Phi: X to X_{can}$ denote the map from $X$ to its canonical model. Is it true that the canonical model of $X$ is always smooth and $Phi$ has no singular fibers?

Canonical solution of a scoping problem

Scoping is a recurrent issue on this forum.

Yet, I stumble again and again at the same thing. Googling over this site does not quickly bring a solution. Two reasons:

  1. There are many low quality answers such as this one (and I can
    elaborate on this, if needed).
  2. There are many very good answers (this and this), but they are too long.

Sometimes I just want to learn by examples, not by reading many pages of dry theory.
Therefore I would like to ask this question again even at risk being downvoted or the question being closed.

Consider this code




Out(2)= {1,2,3}
Out(4)= {2,4,6}
Out(5)= 5
Out(6)= 10

Or a very similar one




Out(8)= {1,2,3}
Out(10)= {2,4,6}
Out(11)= 5
Out(12)= {10,10,10}

It is clear to me that setting the global variable i interferes with the function definition. I would like to know what is the canonical way of avoiding this interference?.

Please, avoid answer like 2 list. I am more expecting to see a discussion on the interplay of SetDelayed and RuleDelayed.


It turns out that by trying to build a minimal example I simplified that actual problem to nonexistence. Here is my actual difficulty.

I am building a tool to manipulate Feynman diagrams and depict them using the Graph functionality. A diagram might have the following syntax


This is just an example. Now we would like to represent it as a graph.

First way (using RuleDelayed):

pic(diag(x__)):=Module({i},Graph(List(x)/.{g(i_,j_):> DirectedEdge(j,i),v(j_,k_):> UndirectedEdge(j,k)},VertexLabels->"Name",PlotTheme->"Business",ImageSize->300,ImagePadding->10,VertexLabelStyle->Directive(Black,11),GraphHighlight->Cases(List(x),v(i_,j_):> UndirectedEdge(i,j))))

Using it



enter image description here
enter image description here

Thus we have an expected result and a result with wrong labels.

Second way (using Rule)


Now using it


Produces the correct picture only the first time, and does not work at all second time.

Google picks wrong canonical url in search results

When I do a search in google I receive results as expected. When I hover over the search result I can see the correct url. But when I click on it I’m redirected to the homepage. In the search console I find the page not being indexed + google is choosing a different canonical url (homepage) then what is coded in the meta-data. What can I do to solve this? And make google choose the canonical url I indicated.