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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>py-typedlogic: Bridging Formal Logic and Typed Python</title>
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<style>
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.features {
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</style>
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</head>
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<body>
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<div class="container">
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<h1>py-typedlogic</h1>
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<p class="tagline">Bridging Logic and Python</p>
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<div class="features">
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<div class="feature">
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<h3>Python Syntax</h3>
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<p>Write logical axioms using <a href="https://py-typedlogic.github.io/py-typedlogic/tutorial/01-first-program/">familiar Python constructs</a></p>
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</div>
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<div class="feature">
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<h3>Strong Typing</h3>
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<p>Benefit from mypy validation and catch errors early</p>
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</div>
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<div class="feature">
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<h3>Integrations</h3>
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<p>Integration
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with <a href="https://py-typedlogic.github.io/py-typedlogic/integrations/solvers/souffle/">datalog
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engines</a>, <a href="https://py-typedlogic.github.io/py-typedlogic/integrations/solvers/clingo/">answer-set
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programming</a>, <a href="https://py-typedlogic.github.io/py-typedlogic/integrations/solvers/z3/">theorem
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provers</a>, and <a href="https://py-typedlogic.github.io/py-typedlogic/integrations/frameworks/owldl/owldl-tutorial/">OWL-DL</a></p>
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</div>
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</div>
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<h2>See py-typedlogic in Action</h2>
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<div class="code-tabs">
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<div class="tab-buttons">
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<button class="tab-button active"
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onclick="openTab(event, 'python-logic')">Python Theory</button>
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<button class="tab-button" onclick="openTab(event, 'execution')">Reasoning</button>
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<button class="tab-button" onclick="openTab(event, 'output')">Output</button>
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<button class="tab-button" onclick="openTab(event, 'axioms')">Axioms</button>
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</div>
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<div id="python-logic" class="code-sample active">
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<pre><code>from pydantic import BaseModel
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from typedlogic import FactMixin, Term
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from typedlogic.decorators import axiom
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ID = str
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class Link(BaseModel, FactMixin):
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"""A link between two entities"""
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source: ID
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target: ID
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class Path(BaseModel, FactMixin):
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"""An N-hop path between two entities"""
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source: ID
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target: ID
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hops: int
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@axiom
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def path_from_link(x: ID, y: ID):
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"""If there is a link from x to y, there is a path from x to y"""
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assert Link(source=x, target=y) >> Path(source=x, target=y, hops=1)
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@axiom
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def transitivity(x: ID, y: ID, z: ID, d1: int, d2: int):
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"""Transitivity of paths, plus hop counting"""
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assert ((Path(source=x, target=y, hops=d1) & Path(source=y, target=z, hops=d2)) >>
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Path(source=x, target=z, hops=d1+d2))</code></pre>
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</div>
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<div id="execution" class="code-sample">
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<pre><code>from typedlogic.integrations.souffle_solver import SouffleSolver
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from links import Link
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import links as links
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solver = SouffleSolver()
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solver.load(links) ## source for definitions and axioms
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# Add data
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links = [Link(source='CA', target='OR'), Link(source='OR', target='WA')]
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for link in links:
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solver.add(link)
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model = solver.model()
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for fact in model.iter_retrieve("Path"):
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print(fact)</code></pre>
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</div>
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<div id="output" class="code-sample">
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<pre><code>Path(source='CA', target='OR', hops=1)
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Path(source='OR', target='WA', hops=1)
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Path(source='CA', target='WA', hops=2)</code></pre>
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</div>
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<div id="axioms" class="code-sample">
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<pre><code>∀[x:ID y:ID]. Link(x, y) → Path(x, y, 1)
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∀[x:ID y:ID z:ID d1:int d2:int]. Path(x, y, d1) ∧ Path(y, z, d2) → Path(x, z, d1+d2)
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</code></pre>
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</div>
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</div>
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<div class="cta">
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<a href="https://py-typedlogic.github.io/py-typedlogic/" class="button">Get Started with py-typedlogic</a>
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</div>
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</div>
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</body>
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</html>

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