End the U.S. blockade of Cuba now!

  For over six decades, the United States has maintained a comprehensive economic blockade against socialist Cuba. What began as a Cold War aggression in the 1960s continues today.

Согласованность API по принципу единого источника истины

Привет, Хабр! Представим ситуацию: идет тяжёлый спринт, вы выполнили кучу задач, написали тонну нового функционала, готовитесь к релизу и вдруг обнаруживайте, что часть фич перестала работать! Идёте...

5th Federalism Workshop on Legislative-Executive Design held for NCRC in Juba, South Sudan – Max Planck Foundation for International Peace and the Rule of Law

データベースはなぜ大切なのか？多くの人が説明できない概念的な考え方について - Qiita

はじめに 「データベースは重要だ」 という言葉をよく耳にします。 そしてデータベースが「技術的に」何故大切なのか？ という事については調べればすぐに出てきます。 しかし根本的な考え方やデータベースへの捉え方。 データベースに対する「概念的な」大切さを説いている人は意外にも...

Formal Foundations for the Single Source of Truth Principle

Any system encoding facts faces a fundamental constraint: when multiple independent locations encode the same fact, truth becomes indeterminate. We prove that DOF = 1 (Single Source of Truth) is the unique representation guaranteeing coherence, the impossibility of disagreement among encodings. The Core Theorem (Oracle Arbitrariness). In any incoherent encoding system (DOF > 1 with divergent values), no resolution is principled: for ANY oracle claiming to identify the "true" value, there exists an equally-present value that disagrees. This is not about inconvenience. It is about the determinacy of truth. Programming languages instantiate this epistemic structure: encoding systems become codebases, facts become structural specifications (class existence, method signatures), coherence becomes consistency across encoding locations, and DOF = 1 becomes the Single Source of Truth (DRY principle). Encoding systems → CodebasesFacts → Structural specifications (class existence, method signatures)Coherence → Consistency across encoding locationsDOF = 1 → Single Source of Truth (DRY principle)We prove that achieving DOF = 1 for structural facts requires specific language features: definition-time hooks AND introspectable derivation. Most mainstream languages (Java, C++, Rust, Go, TypeScript, etc.) lack these features and cannot achieve coherence for structural facts regardless of programmer effort. Four Theorems: Coherence Forcing: DOF = 1 is the unique value guaranteeing coherence. DOF = 0 means the fact is unrepresented; DOF > 1 permits incoherent states.Oracle Arbitrariness: Under incoherence, any resolution is arbitrary, no oracle is justified by the encodings alone.Language Requirements: For structural facts in software, DOF = 1 requires definition-time hooks AND introspection. These are logically forced.Strict Dominance: The coherence restoration complexity gap is unbounded: O(1) vs Ω(n).Theoretical Foundation. The derivation theory (independence, derivability, axis collapse) is established in previous work (https://zenodo.org/records/18123532). This paper proves the coherence consequences and instantiates them to programming languages. All theorems machine-checked in Lean 4 (2,104 lines, 119 theorems). Practical demonstration via OpenHCS PR #44: migration from 47 scattered checks to 1 ABC (DOF 47 → 1).

Tool-Chaos im Mittelstand – So bringst Du Ordnung in Deine Softwarelandschaft

Viele Tools, wenig Überblick? Erfahre, wie Du als Mittelständler Deine Softwarelandschaft entschlackst und mit weniger Tools produktiver arbeitest.

Workshop on Fiscal Federalism for the National Constitutional Review Commission (NCRC) in Juba, South Sudan – Max Planck Foundation for International Peace and the Rule of Law