Logic ForAll

Forro' Logico: A blog to keep things.

Saturday, May 30, 2026

Synthetic Mathematics in the Amazon

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Talking about Synthetic Mathematics in the middle of the Amazon rainforest felt slightly surreal. Parintins is famous for the Festival do Bo...
Wednesday, April 29, 2026

Problems, Problems Everywhere

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  Kolmogorov and Alexandrov on a trip. From CultureMath , 2022.    Problems, Problems Everywhere  There’s a particular kind of mathematical ...
Friday, April 24, 2026

Remembering Marta Bunge

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  The Bunge Family: Mario, Eric, Marta and Silvia Some mathematical projects are less about proving theorems and more about bringing people ...
Thursday, April 23, 2026

On Skolemization... again

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  ... and Why It Fails Constructively There is a standard move in classical logic that feels so innocent. You take a formula with existent...
Wednesday, April 22, 2026

Skolem is not constructive

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(but sometimes it can be) On what goes wrong when you try to eliminate quantifiers intuitionistically proof theory constructive logic Skolem...
Monday, April 20, 2026

Ariadne Posts: On Not Yet Knowing the Way Out

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My previous series of blog posts—what I’ve been calling the Penelope posts —has been about revisiting past work. These are papers written wi...
Tuesday, April 7, 2026

A Recipe for Models, Told Twice

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  Dr Andrea Schalk ,  School of Computer Science at The University of Manchester One of the pleasures of long mathematical collaborations ...
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Valeria
Valeria de Paiva is a mathematician and computer scientist based in Cupertino, CA. She worked as a Principal Scientist at Samsung Research America. Previously she was a senior applied scientist at Nuance Communications, Sunnyvale, CA. Earlier she was at Rearden Commerce and she was a search analyst at Cuil, Inc. in Menlo Park, CA, from May 2008-Sept 2010. Before that she was a research scientist at the Intelligent Systems Laboratory of PARC (Palo Alto Research Center), California (2000-2008). She received her PhD in Mathematics from Cambridge University in 1988 for work on "Dialectica Categories", under Martin Hyland's supervision, and has ever since worked on logical approaches to computation, especially using Category Theory.
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