Symbol P
P is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
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Why this formula appears here
The formula is not a calculator anyone runs to get a number; the value of stating it is that it forces every claim to name its competing abiotic hypothesis explicitly rather than treating the absence of an alternative explanation as evidence that none exists. A biosignature claim is exactly as strong as the list of abiotic pathways it has priced into P(D ) and no stronger — a point equally true of a rover’s organic detection, a spectroscopic retrieval, and a bench synthesis claiming relevance to a real planet.
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Symbol D
D is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Read this term in its guide →Symbol H_ab
b is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
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Read this expression with the definitions, units, and assumptions supplied by the article.
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Published contexts (1)
A symbol can carry a different meaning in another article. Each occurrence keeps its own guide and term definitions.
Equation 5 · Astrobiology
Comparing the Main Approaches to Origins of Life and Astrobiology
This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.
The formula is not a calculator anyone runs to get a number; the value of stating it is that it forces every claim to name its competing abiotic hypothesis explicitly rather than treating the absence of an alternative explanation as evidence that none exists. A biosignature claim is exactly as strong as the list of abiotic pathways it has priced into P(D ) and no stronger — a point equally true of a rover’s organic detection, a spectroscopic retrieval, and a bench synthesis claiming relevance to a real planet.
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