Source-pinned research

Research proof index

Search theorem names, mathematical ideas, modules, topics, projects, and role-labelled researchers. Open a result for its complete indexed Lean declaration and source record.

This index contains 6 research declarations. Search 10,000 more complete Mathlib declarations.

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Project-declaredLean 4.30.0

Deriv exp heat Kernel

Heat.deriv_exp_heatKernel

Plain-language statement

Derivative of the exponential term exp(-(x²)/(4αt)) with respect to x.

partial differential equationsSobolev spacesanalysis

Source project: PDE

Person-level attribution pending.

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Project-declaredLean 4.30.0

Deriv sqrt inv

Heat.deriv_sqrt_inv

Plain-language statement

Derivative of 1/√x at a positive point.

partial differential equationsSobolev spacesanalysis

Source project: PDE

Person-level attribution pending.

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Project-declaredLean 4.30.0

Has Deriv At heat Kernel t

Heat.hasDerivAt_heatKernel_t

Plain-language statement

The time derivative of the heat kernel ∂/∂t heatKernel(α, x, t).

partial differential equationsSobolev spacesanalysis

Source project: PDE

Person-level attribution pending.

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Project-declaredLean 4.30.0

Has Deriv At heat Kernel x x

Heat.hasDerivAt_heatKernel_x_x

Project documentation

Auxiliary lemma: derivative of the first spatial derivative's formula.

partial differential equationsSobolev spacesanalysis

Source project: PDE

Person-level attribution pending.

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Project-declaredLean 4.30.0

Has Deriv At heat Kernel xx

Heat.hasDerivAt_heatKernel_xx

Plain-language statement

The second spatial derivative of the heat kernel ∂²/∂x² heatKernel(α, x, t).

partial differential equationsSobolev spacesanalysis

Source project: PDE

Person-level attribution pending.

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Project-declaredLean 4.30.0

Integral heat Kernel one gaussian

Heat.integral_heatKernel_one_gaussian

Plain-language statement

Property 2: The heat kernel integrates to one over all of ℝ. This shows that the heat kernel is properly normalized and can be interpreted as a probability density function (specifically, a Gaussian distribution).

partial differential equationsSobolev spacesanalysis

Source project: PDE

Person-level attribution pending.

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