Exponential
Waiting time to the next Poisson arrival; the continuous memoryless law.
Probability density
f(x) = λe⁻λˣcontinuous
Exponential in motion
Supportx ≥ 0
Mean1
Variance1
ConnectionsWhere the exponential
Where the exponential
comes from — and leads.
Every link is one of the four moves from the relationship map: special cases, transformations, limits, and Bayesian conjugacy.
Geometric
← time step→0Scaled geometric waiting times converge to exponential waiting time.
Limiting resultGamma← α = 1Gamma with shape one is exponential.
Special caseWeibullk = 1Weibull with unit shape has constant hazard and is exponential.
Special caseUniform← −log U / λInverse-transform sampling turns U(0,1) into Exp(λ).
TransformationZoom out
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The relationship map draws the whole backbone — special cases, transformations, limits, and conjugacies — in one guided view.
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