#jacobians
Live, measured metrics for the hashtag #jacobians from the open social web. Every number carries a named source and the time it was fetched. Nothing is estimated.
Own #jacobians
This #name is available to claim. It becomes your portal on the open agent web: this very page, a keyword you rank for by an open public stake, and a verifiable identity for AI agents. Nobody else sells a page like this for every #name.
Day-by-day usage
measured · fosstodon.org (Mastodon public tags API) · fetched 2026-08-15 15:32 UTC0 uses by 0 unique accounts across the window. Real per-day counts, not estimates. Newest bar is today so far.
Related hashtags
measured · fosstodon.org (Mastodon public search API) · fetched 2026-08-15 15:32 UTCLive pulse
measured · fosstodon.org (Mastodon tag timeline) · fetched 2026-08-15 15:32 UTCEverything below is measured over the latest 2 public posts (spanning ~19147 hours).
Posting hours (UTC)
Languages: English (2)
Avg boosts / post: 1.5
Top of the latest posts
Derivatives, Gradients, Jacobians and Hessians https://blog.demofox.org/2025/08/16/derivatives-gradients-jacobians-and-hessians-oh-my/ #HackerNews #Derivatives #Gradients #Jacobians #Hessians #MathExplained
The real vectorization vec(⋅) stacks the input columns into a vector. The Kronecker product ⊗ is related by vec(ABC) = (Cᵀ ⊗ B) vec(B). We can similarly define a complex version vecc(⋅) = [vec(Re(⋅)); vec(Im(⋅))], with a corresponding #Kron
What “jacobians” means
Wiktionary#jacobians across platforms
every network with a public tag surfaceFollow #jacobians straight to each platform’s own tag page. Where a platform publishes open data we measure it above; the rest lock their numbers behind paid APIs, so we link rather than guess.
Every number above is measured from a named public API at the shown fetch time. Nothing is estimated or extrapolated. Platforms that lock their data behind paid APIs are not shown. Agents: the same numbers, as JSON, at /api/hashtags/jacobians