blog.plover.com
Registered
Page analyze update date:
2026/02/22 10:47:09
Last whois update date:
2026/02/22 10:46:06
Domain Status
Registered
Paid till
12.10.2026
Available from
11.11.2026
×
![Fullscreen website screenshot]()
blog.plover.com Website screenshot
SEO Score
53.42%
78
Score achieved
146
Maximum score
Main Information
Title: The Universe of Discourse
Description: unknown
Keywords: unknown
Page Encoding:
utf-8
Body and server charset are different!
Page Filesize: 212 KB
Server Information
IP: 23.92.19.230
Location: United States,US,Cedar Knolls,07927,40.8229,-74.4592,America/New_York
Http Server: apache/2.4.41 (ubuntu)
Meta Tags List
- name: referrer content: always
- equiv: Content-type content: text/html;charset=UTF-8
- name: viewport content: width=device-width
- property: og:title content: Proof by insufficient information
- property: og:site_name content: The Universe of Discourse
- property: og:description content: From the highly eclectic blog of Mark Dominus
- property: og:type content: article
- property: og:image content: https://pic.blog.plover.com/law/crab-cakes/Fenchurch-2026-th-sq.jpg
- property: og:image:width content: 100
- property: og:image:height content: 100
- property: og:image:alt content: (no alt)
- property: og:url content: https://blog.plover.com/math/proof-by-symmetry.html
- name: google-site-verification content: XLxterQkreKJ10X-T_OAhtcZfF6si4ZF2vupilmCNEM
Internal Links
External Links
Whois Information
domain_name: plover.com
update_date: 2025-04-06T02:22:33Z
update_time: 1743906153
creation_date: 1995-10-13T04:00:00Z
creation_time: 813556800
expiration_date: 2026-10-12T04:00:00Z
Whois Raw Data
Domain Name: PLOVER.COM
Registrar: Gandi SAS
Domain Status: client transfer prohibited
Creation Date: 1995-10-13T04:00:00Z
Registry Expiry Date: 2026-10-12T04:00:00Z
Updated Date: 2025-04-06T02:22:33Z
Name Server: NS1.LINODE.COM
Name Server: NS2.LINODE.COM
Name Server: NS3.LINODE.COM
Name Server: NS4.LINODE.COM
REGISTRAR Contact: Gandi SAS
>>> Last update of RDAP database: 2026-02-22T13:46:06Z
SEO Audit
Technical SEO
✓
Response Code
200
Status 200 OK - page loads correctly.
!
Character Encoding
Page: utf-8, Header:
Character encoding mismatch between HTML and HTTP headers.
✓
Page Size
218069 bytes
Page size acceptable for fast loading.
✓
Resources
40 total
Moderate number of resources. Consider combining files.
✓
Hreflang Tags
0 hreflang tags
Add hreflang tags if you have multilingual content.
!
Robots.txt
Missing
Add robots.txt file to control search engine crawling.
!
Sitemap
Not found
Add sitemap.xml and reference it in robots.txt.
✓
HTTPS
Yes
Secure HTTPS connection enabled.
✓
Compression
gzip
Gzip or Zstd compression enabled for faster loading.
!
Caching
Not set
Add cache-control headers to improve loading speed for returning visitors.
✓
Page Speed
1.78 ms
Excellent loading speed.
On-Page SEO
!
Title
The Universe of Discourse
Title too short. Expand to 30-60 characters for better SEO.
!
Meta Description
Lenght:0
Add a meta description (100-160 characters recommended).
✓
H1 Heading
1 found - "The Universe of Discourse"
Good - single H1 heading found.
✓
Word Count
12028
Content very comprehensive. Consider breaking into multiple pages if too long.
!
Canonical Tag
Add canonical tag to prevent duplicate content issues.
✓
Duplicate Meta
[]
No duplicate meta tags found.
✓
Keywords
Meta keywords are optional (not used by major search engines).
Content and UX
!
Language
Add lang attribute to tag for accessibility and SEO.
!
Images
29 total, 5 missing ALT
Add ALT text to images for accessibility and SEO.
✓
Viewport
width=device-width
Viewport meta tag properly set for mobile devices.
✓
Open Graph
All OG tags present.
All essential OpenGraph tags present.
!
Structured Data
0 JSON-LD scripts
Add structured data (JSON-LD) for rich snippets and better SEO.
Positions in Google
Search Phrases - Google
| Position | Phrase | Page | Snippet |
|---|---|---|---|
| 4 | /math/PM.html | ||
| 6 | /lang/known-to-man.h... |