Symbol in context

$A$

This entry links every published equation using this exact notation. Its meaning may change between equations.

Meanings in context

Article-grounded definition

Symbol A

the observable.

Read equation 4 in How Post-CMOS, Neuromorphic, Photonic, and Quantum AI Compute Actually Works →

Article-grounded definition

Symbol A

availability — the fraction of time the fleet is actually up and assigned to the job rather than down for failure, repair, or checkpoint recovery.

Read equation 1 in AI Accelerator Architecture in Practice: An Advanced Technical Guide →

Article-grounded definition

Symbol A

the forward projection operator.

Read equation 6 in How Mathematics, Proof, and Scientific Computation Actually Work →

Article-grounded definition

Symbol A

the objectively superior technology, and it can lock in permanently long before the alternative gets a fair trial.

Read equation 1 in Reactor Phylogenetics: The Family Tree of Fission Power →

Article-grounded definition

Symbol A

the fix the mass number.

Read equation 19 in The Valley of Stability Is a Fitness Landscape →

Article-grounded definition

Symbol A

a prefactor from fluctuations around that solution.

Read equation 11 in The Vacuum Has a History: Symmetry Breaking as Speciation →

Article-grounded definition

Symbol A

a taxon-specific growth constant.

Read equation 1 in The Longest Childhood: Life-History Theory and the Grandmother Bet →

Article-grounded definition

Symbol A

the ask set.

Read equation 3 in What Claude Code's Permission Model Actually Allows, in Plain Terms →

Article-grounded definition

Symbol A

trained.

Read equation 2 in Actually Deploying an Open-Weight Model in Production →

Article-grounded definition

Symbol A

at least as good on every axis and strictly better on at least one.

Read equation 9 in Why Cost and Latency Belong in the Evaluation Score, Not a Footnote →

Article-grounded definition

Symbol A

at least as good on every axis and strictly better on at least one: [displayed formula].

Read equation 12 in Why Cost and Latency Belong in the Evaluation Score, Not a Footnote →

Article-grounded definition

Symbol A

the agent.

Read equation 18 in Why Cost and Latency Belong in the Evaluation Score, Not a Footnote →

Article-grounded definition

Symbol A

the die area.

Read equation 1 in When the Substrate Became the Product →

Article-grounded definition

Symbol A

the economically automatable share of a task family be represented schematically.

Read equation 21 in Humanity Has Always Been a Human–Technology System →

Used in 86 equations

\delta(A) = \begin{cases} +a_P A^{-1/2} & \text{even-even } N,Z \\ 0 & \text{odd } A \\ -a_P A^{-1/2} & \text{odd-odd } N,Z \end{cases}

The Valley of Stability Is a Fitness Landscape · Equation 9

This equation states an equality: the expressions on both sides have the same value under the article’s assumptions.

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a_V A

The Valley of Stability Is a Fitness Landscape · Equation 10

This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.

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A

The Valley of Stability Is a Fitness Landscape · Equation 12

This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.

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-a_A (A-2Z)^2/A

The Valley of Stability Is a Fitness Landscape · Equation 15

This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.

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A

The Valley of Stability Is a Fitness Landscape · Equation 18

This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.

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A

The Valley of Stability Is a Fitness Landscape · Equation 19

the fix the mass number.

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A

The Valley of Stability Is a Fitness Landscape · Equation 22

the fix the mass number.

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M(A,Z)\,c^2 \approx \alpha(A) - \beta(A)\,Z + \gamma(A)\,Z^2 \mp \delta(A)

The Valley of Stability Is a Fitness Landscape · Equation 24

This equation gives an approximation: it relates the quantities while allowing an approximation.

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\delta(A)

The Valley of Stability Is a Fitness Landscape · Equation 28

This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.

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A

The Valley of Stability Is a Fitness Landscape · Equation 31

This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.

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A

The Valley of Stability Is a Fitness Landscape · Equation 35

This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.

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A

The Valley of Stability Is a Fitness Landscape · Equation 37

This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.

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A

The Valley of Stability Is a Fitness Landscape · Equation 41

This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.

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\frac{\Gamma}{V} = A\,e^{-S_E},

The Vacuum Has a History: Symmetry Breaking as Speciation · Equation 11

This equation states an equality: the expressions on both sides have the same value under the article’s assumptions.

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A

The Vacuum Has a History: Symmetry Breaking as Speciation · Equation 13

a prefactor from fluctuations around that solution.

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\frac{dw}{dt} = A w^{0.75}

The Longest Childhood: Life-History Theory and the Grandmother Bet · Equation 1

This equation states an equality: the expressions on both sides have the same value under the article’s assumptions.

Equation guide → · This term → · Article →

A

The Longest Childhood: Life-History Theory and the Grandmother Bet · Equation 3

a taxon-specific growth constant.

Equation guide → · This term → · Article →

A

The Longest Childhood: Life-History Theory and the Grandmother Bet · Equation 4

a taxon-specific growth constant.

Equation guide → · This term → · Article →

A

Frontier AI Model Comparisons: A First-Principles Introduction · Equation 3

This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.

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P(A \succ B) = \frac{1}{1 + e^{-(\theta_A - \theta_B)}}.

Frontier AI Model Comparisons: A First-Principles Introduction · Equation 5

This equation states an equality: the expressions on both sides have the same value under the article’s assumptions.

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A

From Origins to Frontier: A History of Frontier AI Model Comparisons · Equation 4

This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.

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P(A \succ B) = \frac{1}{1 + 10^{-(R_A - R_B)/400}}.

From Origins to Frontier: A History of Frontier AI Model Comparisons · Equation 6

This equation states an equality: the expressions on both sides have the same value under the article’s assumptions.

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A

From Origins to Frontier: A History of Frontier AI Model Comparisons · Equation 7

This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.

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A

From Origins to Frontier: A History of Frontier AI Model Comparisons · Equation 11

This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.

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A

What Claude Code's Permission Model Actually Allows, in Plain Terms · Equation 3

the ask set.

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\text{decision}(c) = \begin{cases} \text{deny}, & c \in D \\ \text{ask}, & c \notin D \text{ and } c \in A \\ \text{allow}, & c \notin D \cup A \text{ and } c \in W \\ \text{ask (default)}, & \text{otherwise} \end{cases}

What Claude Code's Permission Model Actually Allows, in Plain Terms · Equation 5

This equation states an equality: the expressions on both sides have the same value under the article’s assumptions.

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W = W_0 + \Delta W = W_0 + BA, \qquad B \in \mathbb{R}^{d \times r},\ A \in \mathbb{R}^{r \times k},\ r \ll \min(d, k)

Actually Deploying an Open-Weight Model in Production · Equation 2

This equation states an equality: the expressions on both sides have the same value under the article’s assumptions.

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A

Actually Deploying an Open-Weight Model in Production · Equation 4

trained.

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BA

Actually Deploying an Open-Weight Model in Production · Equation 11

This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.

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L(N, D) \approx E + \frac{A}{N^{\alpha}} + \frac{B}{D^{\beta}}

Shrink It, Train It Small, or Search for It: The Main Strategies for Small Models, Compared · Equation 8

This equation gives an approximation: it relates the quantities while allowing an approximation.

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AAA

Meanings in context

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Used in 86 equations

$A$