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Followers
186
Account age
8 yrs
💰 Suggested sponsorship rate
$40 – $65 / sponsored post
Estimated from audience size & typical reach — every deal is negotiable and held in SocialDB escrow.
🧰 Free analysis for Chris Purcell
📊 Post engagement
5
Avg engagement / post
2.7%
Engagement vs followers
Jan 2018
On Mastodon since
🔥 Top post: What are some examples of non-trivial finite sequences, whose de · 10 likes + reposts
📊 Activity & format
Posting cadence
0.25 / week
A lower-frequency account — each post lands with more weight.
Content mix
Mostly text
Recent: 11 text · 1 image · 0 video.
Follower / following
1.8×
Follows 102 back. A more reciprocal / networked account.
Recent posts
View on Mastodon ↗
I just learned the sad news that my former postdoc advisor Zdeněk Ryjáček has passed away.
I recommend checking out his paper (link below) On a Closure Concept in Claw-free Graphs. It's short and clear, and proves the surprising result tha…
Just a heads up about Orbán. What happened here in the Czech republic is that the populist Babiš was ousted after a long time in power, due to the growing discontent with his corruption and incompetence. The centre right, pro European part…
Ten years ago today I was in Dublin for St. Patrick's day and visited Broom Bridge where Hamilton scored the formula for quaternions for the first time.
A friend of mine with Irish heritage happened to ask me today about fields and divisio…
I've become interested in polyominoes recently and have had a few questions about them I couldn't easily find answers to. Here's one:
Let's call an n-omino "balanced" if its 2 colouring has \(\lfloor\frac{n}{2}\rfloor\) cells of one colour…
So the X pentomino fits into a rectangle which is smaller than its "bounding box". In this case we have a square of area 8, where the bounding box would be a 3x3 square. I suppose it's the smallest example, but is there an easy proof? I ca…
Here's a blatantly false statement:
Let G be a cubic #graph embedded in the plane with a proper 3-edge colouring. Colour a vertex black if the clockwise ordering of the colours of its incident edges is rgb and white if the ordering is rbg.…
I use arxivist.com (check it out) which scores arxiv posts according to some likes and dislikes you enter on the website, and emails you the top 5 per day. Most days, the top 5 have a score between 90 and 120 but occasionally the scores ar…
I've been reading a lot of Terry Pratchett recently and it's affected my writing. I've written two wry footnotes in the manuscript I've been working on!
A similar phenomenon: I've been learning the mandolin and it's affected my bass playin…
Very happy to be proved wrong about any implicit claims made here. But for the record I do only care about tilings with regular spherical polygons
The only semi-regular* spherical* polyhedra are the Platonic solids*, Archimedean solids, prisms, antiprisms and that one almost-Archimedean solid.
I think the proof of this is relatively straightforward and purely combinatorial. I found a…
Do people tend to underestimate or overestimate thirds? Does it vary a lot?
I consistently underestimate thirds; when tasked with cutting an orange into thirds I cut off what looks like a third then cut the remainder in half. The first th…
So the X pentomino fits into a rectangle which is smaller than its "bounding box". In this case we have a square of area 8, where the bounding box would be a 3x3 square. I suppose it's the smallest example, but is there an easy proof? I ca…
Here's a blatantly false statement:
Let G be a cubic #graph embedded in the plane with a proper 3-edge colouring. Colour a vertex black if the clockwise ordering of the colours of its incident edges is rgb and white if the ordering is rbg.…
I use arxivist.com (check it out) which scores arxiv posts according to some likes and dislikes you enter on the website, and emails you the top 5 per day. Most days, the top 5 have a score between 90 and 120 but occasionally the scores ar…
I've been reading a lot of Terry Pratchett recently and it's affected my writing. I've written two wry footnotes in the manuscript I've been working on!
A similar phenomenon: I've been learning the mandolin and it's affected my bass playin…
Very happy to be proved wrong about any implicit claims made here. But for the record I do only care about tilings with regular spherical polygons
The only semi-regular* spherical* polyhedra are the Platonic solids*, Archimedean solids, prisms, antiprisms and that one almost-Archimedean solid.
I think the proof of this is relatively straightforward and purely combinatorial. I found a…
Do people tend to underestimate or overestimate thirds? Does it vary a lot?
I consistently underestimate thirds; when tasked with cutting an orange into thirds I cut off what looks like a third then cut the remainder in half. The first th…
🐘 Community & instance
Home server
mathstodon.xyz
Their home server on the fediverse — the instance a creator picks signals the community they belong to.
On Mastodon since
Jan 2018
An OG fediverse account from Mastodon's early years — a long, established presence.
💡 Facts
🗓️Joined Mastodon in 2018 — 8 years ago.
👁️Averages 5 views per post.
📤Posts about 0.3× per week.
🕵️ Fake follower check
Estimated80/100
Excellent
Credibility score
97%
Real
Real audience
Low
Fake-follower risk
High
Data confidence
- Est. 97% real, active audience · Low fake-follower risk.
- Strong engagement (~2.7% of followers engage each post) — an active, real audience.
- Established account (8+ years old).
Heuristic estimate from engagement, follower ratios, account age & growth — a screening signal, not a guarantee.
About
Mathematician, computer scientist, bassist, knitter?
🔀 Audience overlap
EstimatedEstimated shared audience with similar creators — useful for avoiding overlap (or doubling down) when planning a campaign.
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