Type Theory Forall
@ttforall.bsky.social
Making Type Theory, Programming Languages and Formal methods more accessible! http://typetheoryforall.com
Pinned
Type Theory Forall
@ttforall.bsky.social
· May 23
🚨 New drop alert! 🚨
Support Type Theory Forall and rep your love for types with our official merch 🧵✨
🛒 Check out the store: store.typetheoryfora...
🎁 Use code typetheory for 10% off — limited time only!
Let the world know you quantify forall the right reasons. 🔥
Support Type Theory Forall and rep your love for types with our official merch 🧵✨
🛒 Check out the store: store.typetheoryfora...
🎁 Use code typetheory for 10% off — limited time only!
Let the world know you quantify forall the right reasons. 🔥
Your proof assistant is strict.
Your type system is expressive.
Your coffee mug should be too ☕
FP & ITP mugs (OCaml, Haskell, Lean, Rocq, Isabelle, Agda):
store.typetheoryfora...
Your type system is expressive.
Your coffee mug should be too ☕
FP & ITP mugs (OCaml, Haskell, Lean, Rocq, Isabelle, Agda):
store.typetheoryfora...
January 31, 2026 at 4:30 PM
Your proof assistant is strict.
Your type system is expressive.
Your coffee mug should be too ☕
FP & ITP mugs (OCaml, Haskell, Lean, Rocq, Isabelle, Agda):
store.typetheoryfora...
Your type system is expressive.
Your coffee mug should be too ☕
FP & ITP mugs (OCaml, Haskell, Lean, Rocq, Isabelle, Agda):
store.typetheoryfora...
Type Theory Forall exists because this community exists.
If the podcast, the conversations, or the ideas mattered to you, this is one way to support it — and look good doing it 👕
👉 store.typetheoryfora...
If the podcast, the conversations, or the ideas mattered to you, this is one way to support it — and look good doing it 👕
👉 store.typetheoryfora...
January 30, 2026 at 4:29 PM
Type Theory Forall exists because this community exists.
If the podcast, the conversations, or the ideas mattered to you, this is one way to support it — and look good doing it 👕
👉 store.typetheoryfora...
If the podcast, the conversations, or the ideas mattered to you, this is one way to support it — and look good doing it 👕
👉 store.typetheoryfora...
New TTFA episode 🎙️
The category-theoretic episode we’ve ever done.
A deep dive into Category Theory, Type Theory, and Logic with Valeria de Paiva — co-founder of the Topos Institute and founder of Women in Logic.
The category-theoretic episode we’ve ever done.
A deep dive into Category Theory, Type Theory, and Logic with Valeria de Paiva — co-founder of the Topos Institute and founder of Women in Logic.
Type Theory Forall
Type Theory much beyond inference rules
www.typetheoryforall.com
January 29, 2026 at 5:50 PM
New TTFA episode 🎙️
The category-theoretic episode we’ve ever done.
A deep dive into Category Theory, Type Theory, and Logic with Valeria de Paiva — co-founder of the Topos Institute and founder of Women in Logic.
The category-theoretic episode we’ve ever done.
A deep dive into Category Theory, Type Theory, and Logic with Valeria de Paiva — co-founder of the Topos Institute and founder of Women in Logic.
Your proof assistant is strict.
Your type system is expressive.
Your coffee mug should be too ☕
FP & ITP mugs (OCaml, Haskell, Lean, Rocq, Isabelle, Agda):
store.typetheoryfora...
Your type system is expressive.
Your coffee mug should be too ☕
FP & ITP mugs (OCaml, Haskell, Lean, Rocq, Isabelle, Agda):
store.typetheoryfora...
January 27, 2026 at 3:31 PM
Your proof assistant is strict.
Your type system is expressive.
Your coffee mug should be too ☕
FP & ITP mugs (OCaml, Haskell, Lean, Rocq, Isabelle, Agda):
store.typetheoryfora...
Your type system is expressive.
Your coffee mug should be too ☕
FP & ITP mugs (OCaml, Haskell, Lean, Rocq, Isabelle, Agda):
store.typetheoryfora...
Type Theory Forall exists because this community exists.
If the podcast, the conversations, or the ideas mattered to you, this is one way to support it — and look good doing it 👕
👉 store.typetheoryfora...
If the podcast, the conversations, or the ideas mattered to you, this is one way to support it — and look good doing it 👕
👉 store.typetheoryfora...
January 26, 2026 at 4:29 PM
Type Theory Forall exists because this community exists.
If the podcast, the conversations, or the ideas mattered to you, this is one way to support it — and look good doing it 👕
👉 store.typetheoryfora...
If the podcast, the conversations, or the ideas mattered to you, this is one way to support it — and look good doing it 👕
👉 store.typetheoryfora...
Your proof assistant is strict.
Your type system is expressive.
Your coffee mug should be too ☕
FP & ITP mugs (OCaml, Haskell, Lean, Rocq, Isabelle, Agda):
store.typetheoryfora...
Your type system is expressive.
Your coffee mug should be too ☕
FP & ITP mugs (OCaml, Haskell, Lean, Rocq, Isabelle, Agda):
store.typetheoryfora...
January 23, 2026 at 4:29 PM
Your proof assistant is strict.
Your type system is expressive.
Your coffee mug should be too ☕
FP & ITP mugs (OCaml, Haskell, Lean, Rocq, Isabelle, Agda):
store.typetheoryfora...
Your type system is expressive.
Your coffee mug should be too ☕
FP & ITP mugs (OCaml, Haskell, Lean, Rocq, Isabelle, Agda):
store.typetheoryfora...
Type Theory Forall exists because this community exists.
If the podcast, the conversations, or the ideas mattered to you, this is one way to support it — and look good doing it 👕
👉 store.typetheoryfora...
If the podcast, the conversations, or the ideas mattered to you, this is one way to support it — and look good doing it 👕
👉 store.typetheoryfora...
January 22, 2026 at 6:28 PM
Type Theory Forall exists because this community exists.
If the podcast, the conversations, or the ideas mattered to you, this is one way to support it — and look good doing it 👕
👉 store.typetheoryfora...
If the podcast, the conversations, or the ideas mattered to you, this is one way to support it — and look good doing it 👕
👉 store.typetheoryfora...
Your proof assistant is strict.
Your type system is expressive.
Your coffee mug should be too ☕
FP & ITP mugs (OCaml, Haskell, Lean, Rocq, Isabelle, Agda):
store.typetheoryfora...
Your type system is expressive.
Your coffee mug should be too ☕
FP & ITP mugs (OCaml, Haskell, Lean, Rocq, Isabelle, Agda):
store.typetheoryfora...
January 19, 2026 at 4:30 PM
Your proof assistant is strict.
Your type system is expressive.
Your coffee mug should be too ☕
FP & ITP mugs (OCaml, Haskell, Lean, Rocq, Isabelle, Agda):
store.typetheoryfora...
Your type system is expressive.
Your coffee mug should be too ☕
FP & ITP mugs (OCaml, Haskell, Lean, Rocq, Isabelle, Agda):
store.typetheoryfora...
Type Theory Forall exists because this community exists.
If the podcast, the conversations, or the ideas mattered to you, this is one way to support it — and look good doing it 👕
👉 store.typetheoryfora...
If the podcast, the conversations, or the ideas mattered to you, this is one way to support it — and look good doing it 👕
👉 store.typetheoryfora...
January 18, 2026 at 3:32 PM
Type Theory Forall exists because this community exists.
If the podcast, the conversations, or the ideas mattered to you, this is one way to support it — and look good doing it 👕
👉 store.typetheoryfora...
If the podcast, the conversations, or the ideas mattered to you, this is one way to support it — and look good doing it 👕
👉 store.typetheoryfora...
Your proof assistant is strict.
Your type system is expressive.
Your coffee mug should be too ☕
FP & ITP mugs (OCaml, Haskell, Lean, Rocq, Isabelle, Agda):
store.typetheoryfora...
Your type system is expressive.
Your coffee mug should be too ☕
FP & ITP mugs (OCaml, Haskell, Lean, Rocq, Isabelle, Agda):
store.typetheoryfora...
January 15, 2026 at 6:10 PM
Your proof assistant is strict.
Your type system is expressive.
Your coffee mug should be too ☕
FP & ITP mugs (OCaml, Haskell, Lean, Rocq, Isabelle, Agda):
store.typetheoryfora...
Your type system is expressive.
Your coffee mug should be too ☕
FP & ITP mugs (OCaml, Haskell, Lean, Rocq, Isabelle, Agda):
store.typetheoryfora...
Type Theory Forall exists because this community exists.
If the podcast, the conversations, or the ideas mattered to you, this is one way to support it — and look good doing it 👕
👉 store.typetheoryfora...
If the podcast, the conversations, or the ideas mattered to you, this is one way to support it — and look good doing it 👕
👉 store.typetheoryfora...
January 14, 2026 at 3:36 PM
Type Theory Forall exists because this community exists.
If the podcast, the conversations, or the ideas mattered to you, this is one way to support it — and look good doing it 👕
👉 store.typetheoryfora...
If the podcast, the conversations, or the ideas mattered to you, this is one way to support it — and look good doing it 👕
👉 store.typetheoryfora...
Reposted by Type Theory Forall
In case you missed it, watch this clip from our interview with Andrej Bauer. I love when CS researchers can articulate a philosophy behind their work, and Andrej DELIVERS www.youtube.com/watch?v=GcTF...
#58 - Constructivism and Computation Content - Andrej Bauer
YouTube video by Type Theory Forall
www.youtube.com
December 20, 2025 at 7:00 AM
In case you missed it, watch this clip from our interview with Andrej Bauer. I love when CS researchers can articulate a philosophy behind their work, and Andrej DELIVERS www.youtube.com/watch?v=GcTF...
🎉 5 YEARS OF TYPE THEORY FORALL 🎉
To celebrate, I sat down with Andrej Bauer.
Student of Dana Scott.
A mind equally at home in math and CS.
One of the clearest thinkers in Type Theory.
We dive into Constructivism, Dialectica, Effect Handlers, and AI.
This one is special.
To celebrate, I sat down with Andrej Bauer.
Student of Dana Scott.
A mind equally at home in math and CS.
One of the clearest thinkers in Type Theory.
We dive into Constructivism, Dialectica, Effect Handlers, and AI.
This one is special.
December 18, 2025 at 5:35 PM
🎉 5 YEARS OF TYPE THEORY FORALL 🎉
To celebrate, I sat down with Andrej Bauer.
Student of Dana Scott.
A mind equally at home in math and CS.
One of the clearest thinkers in Type Theory.
We dive into Constructivism, Dialectica, Effect Handlers, and AI.
This one is special.
To celebrate, I sat down with Andrej Bauer.
Student of Dana Scott.
A mind equally at home in math and CS.
One of the clearest thinkers in Type Theory.
We dive into Constructivism, Dialectica, Effect Handlers, and AI.
This one is special.
🎙️ New Type Theory Forall Episode!
#57 — Compilers for Privacy-Preserving Computation, Category Theory, and Keeping a Good Rhythm in Your PhD
This week I talk with Rhagav Malik, fresh off his PhD defense on compilers for privacy-preserving computation. We dig into:
#57 — Compilers for Privacy-Preserving Computation, Category Theory, and Keeping a Good Rhythm in Your PhD
This week I talk with Rhagav Malik, fresh off his PhD defense on compilers for privacy-preserving computation. We dig into:
December 6, 2025 at 4:25 PM
🎙️ New Type Theory Forall Episode!
#57 — Compilers for Privacy-Preserving Computation, Category Theory, and Keeping a Good Rhythm in Your PhD
This week I talk with Rhagav Malik, fresh off his PhD defense on compilers for privacy-preserving computation. We dig into:
#57 — Compilers for Privacy-Preserving Computation, Category Theory, and Keeping a Good Rhythm in Your PhD
This week I talk with Rhagav Malik, fresh off his PhD defense on compilers for privacy-preserving computation. We dig into:
My Spotify Wrapped
December 4, 2025 at 6:26 PM
My Spotify Wrapped
Going live now!
Continuing our Lean 4 Series — today we continue working on MIL, this time on Order and divisibility!
This is part of our ongoing fundraiser to replace my iPhone camera with a proper setup.
Every tip helps!
☕️ko-fi.com/typetheory...
www.twitch.tv/typeth...
Continuing our Lean 4 Series — today we continue working on MIL, this time on Order and divisibility!
This is part of our ongoing fundraiser to replace my iPhone camera with a proper setup.
Every tip helps!
☕️ko-fi.com/typetheory...
www.twitch.tv/typeth...
December 3, 2025 at 7:12 PM
Going live now!
Continuing our Lean 4 Series — today we continue working on MIL, this time on Order and divisibility!
This is part of our ongoing fundraiser to replace my iPhone camera with a proper setup.
Every tip helps!
☕️ko-fi.com/typetheory...
www.twitch.tv/typeth...
Continuing our Lean 4 Series — today we continue working on MIL, this time on Order and divisibility!
This is part of our ongoing fundraiser to replace my iPhone camera with a proper setup.
Every tip helps!
☕️ko-fi.com/typetheory...
www.twitch.tv/typeth...
Last days of our Cyber Monday 15% OFF at the ttfa store!
Mugs, hoodies, shirts — perfect gifts for your nerdiest friends this holiday season.
Enjoy it before it ends: store.typetheoryfora...
Mugs, hoodies, shirts — perfect gifts for your nerdiest friends this holiday season.
Enjoy it before it ends: store.typetheoryfora...
December 2, 2025 at 9:29 PM
Last days of our Cyber Monday 15% OFF at the ttfa store!
Mugs, hoodies, shirts — perfect gifts for your nerdiest friends this holiday season.
Enjoy it before it ends: store.typetheoryfora...
Mugs, hoodies, shirts — perfect gifts for your nerdiest friends this holiday season.
Enjoy it before it ends: store.typetheoryfora...
Reposted by Type Theory Forall
A couple weeks ago I had the great pleasure of inviting Rustan Leino (of Dafny fame) on my podcast, to talk about all sorts of logic stuff!
Part II to come soon!
open.spotify.com/episode/4d9J...
Part II to come soon!
open.spotify.com/episode/4d9J...
Rustan Leino - part I
Spotify video
open.spotify.com
December 1, 2025 at 10:14 PM
A couple weeks ago I had the great pleasure of inviting Rustan Leino (of Dafny fame) on my podcast, to talk about all sorts of logic stuff!
Part II to come soon!
open.spotify.com/episode/4d9J...
Part II to come soon!
open.spotify.com/episode/4d9J...
A fresh episode of Type Theory Exists is live!
Featuring my Gothenburg talk on the evolution of CS through the eyes of Type Theory — Turing, Church, Curry–Howard, and beyond.
🔒 Only for patrons — join us to unlock it:
Featuring my Gothenburg talk on the evolution of CS through the eyes of Type Theory — Turing, Church, Curry–Howard, and beyond.
🔒 Only for patrons — join us to unlock it:
Type Theory Forall | Patreon
An accessible podcast on Type Theory
patreon.com
November 29, 2025 at 3:58 PM
A fresh episode of Type Theory Exists is live!
Featuring my Gothenburg talk on the evolution of CS through the eyes of Type Theory — Turing, Church, Curry–Howard, and beyond.
🔒 Only for patrons — join us to unlock it:
Featuring my Gothenburg talk on the evolution of CS through the eyes of Type Theory — Turing, Church, Curry–Howard, and beyond.
🔒 Only for patrons — join us to unlock it:
🚨 BLACK FRIDAY SALE! 🚨
The entire Type Theory Forall shop is 15% OFF — mugs, shirts, hoodies, literally everything.
Only until the end of the month. Don’t miss it!
🛒🔥 store.typetheoryfora...
Discount is automatically applied at checkout.
The entire Type Theory Forall shop is 15% OFF — mugs, shirts, hoodies, literally everything.
Only until the end of the month. Don’t miss it!
🛒🔥 store.typetheoryfora...
Discount is automatically applied at checkout.
November 25, 2025 at 3:32 PM
🚨 BLACK FRIDAY SALE! 🚨
The entire Type Theory Forall shop is 15% OFF — mugs, shirts, hoodies, literally everything.
Only until the end of the month. Don’t miss it!
🛒🔥 store.typetheoryfora...
Discount is automatically applied at checkout.
The entire Type Theory Forall shop is 15% OFF — mugs, shirts, hoodies, literally everything.
Only until the end of the month. Don’t miss it!
🛒🔥 store.typetheoryfora...
Discount is automatically applied at checkout.
@krismicinski's build a compiler in Five Projects
Build a Compiler in Five Projects
Class website here: https://kmicinski.com/cis531-f25
kmicinski.com
November 25, 2025 at 2:56 AM
@krismicinski's build a compiler in Five Projects
Reposted by Type Theory Forall
My five-project (along with slides, video lectures, etc.) compilers course has all projects now available online free: kmicinski.com/functional-p.... Five projects have you incrementally build a compiler for a substantial language, including functions, mutation, loops, vectors, etc.
Build a Compiler in Five Projects
Class website here: https://kmicinski.com/cis531-f25
kmicinski.com
November 24, 2025 at 3:26 AM
My five-project (along with slides, video lectures, etc.) compilers course has all projects now available online free: kmicinski.com/functional-p.... Five projects have you incrementally build a compiler for a substantial language, including functions, mutation, loops, vectors, etc.
Going live now! Continuing our Lean 4 Series — today I'll start working on Mathematics in Lean
This is part of our ongoing fundraiser to replace my iPhone camera with a proper setup. Every tip helps! 💜
☕️ko-fi.com/typetheory...
www.twitch.tv/typeth...
This is part of our ongoing fundraiser to replace my iPhone camera with a proper setup. Every tip helps! 💜
☕️ko-fi.com/typetheory...
www.twitch.tv/typeth...
November 24, 2025 at 7:06 PM
Going live now! Continuing our Lean 4 Series — today I'll start working on Mathematics in Lean
This is part of our ongoing fundraiser to replace my iPhone camera with a proper setup. Every tip helps! 💜
☕️ko-fi.com/typetheory...
www.twitch.tv/typeth...
This is part of our ongoing fundraiser to replace my iPhone camera with a proper setup. Every tip helps! 💜
☕️ko-fi.com/typetheory...
www.twitch.tv/typeth...
🚨 BLACK FRIDAY SALE! 🚨
The entire Type Theory Forall shop is 15% OFF — mugs, shirts, hoodies, literally everything.
Only until the end of the month. Don’t miss it!
🛒🔥 store.typetheoryfora...
Discount is automatically applied at checkout.
The entire Type Theory Forall shop is 15% OFF — mugs, shirts, hoodies, literally everything.
Only until the end of the month. Don’t miss it!
🛒🔥 store.typetheoryfora...
Discount is automatically applied at checkout.
November 24, 2025 at 4:30 PM
🚨 BLACK FRIDAY SALE! 🚨
The entire Type Theory Forall shop is 15% OFF — mugs, shirts, hoodies, literally everything.
Only until the end of the month. Don’t miss it!
🛒🔥 store.typetheoryfora...
Discount is automatically applied at checkout.
The entire Type Theory Forall shop is 15% OFF — mugs, shirts, hoodies, literally everything.
Only until the end of the month. Don’t miss it!
🛒🔥 store.typetheoryfora...
Discount is automatically applied at checkout.
Going live now!
Continuing our Lean 4 Series — today I’ll be learning Tactics on stream.
This is part of our ongoing fundraiser to replace my iPhone camera with a proper setup. Every tip helps! 💜
▶️ www.twitch.tv/typetheoryfo...
☕️ ko-fi.com/typetheoryfo...
Continuing our Lean 4 Series — today I’ll be learning Tactics on stream.
This is part of our ongoing fundraiser to replace my iPhone camera with a proper setup. Every tip helps! 💜
▶️ www.twitch.tv/typetheoryfo...
☕️ ko-fi.com/typetheoryfo...
TypeTheoryForall - Twitch
Let's learn some type theory togetherWe're currently fundraising to buy a new camera
www.twitch.tv
November 12, 2025 at 7:22 PM
Going live now!
Continuing our Lean 4 Series — today I’ll be learning Tactics on stream.
This is part of our ongoing fundraiser to replace my iPhone camera with a proper setup. Every tip helps! 💜
▶️ www.twitch.tv/typetheoryfo...
☕️ ko-fi.com/typetheoryfo...
Continuing our Lean 4 Series — today I’ll be learning Tactics on stream.
This is part of our ongoing fundraiser to replace my iPhone camera with a proper setup. Every tip helps! 💜
▶️ www.twitch.tv/typetheoryfo...
☕️ ko-fi.com/typetheoryfo...