https://mereth.dev/topics/scheduling/Recent content in Scheduling on Mereth LabsHugoen_GBMon, 12 Jan 2026 00:00:00 +0530https://mereth.dev/problems/forgetting-curve/Mon, 12 Jan 2026 00:00:00 +0530https://mereth.dev/problems/forgetting-curve/<p>Memory decays. Ebbinghaus measured the shape of it more than a century ago: the probability of recall falls off roughly exponentially with time since the last review.</p> <span class="katex"><math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><semantics><mrow><mi>R</mi><mo stretchy="false">(</mo><mi>t</mi><mo stretchy="false">)</mo><mo>=</mo><msup><mi>e</mi><mrow><mo>−</mo><mi>t</mi><mi mathvariant="normal">/</mi><mi>S</mi></mrow></msup></mrow><annotation encoding="application/x-tex"> R(t) = e^{-t / S} </annotation></semantics></math></span><p>where <span class="katex"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>R</mi></mrow><annotation encoding="application/x-tex">R</annotation></semantics></math></span> is retrievability, <span class="katex"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>t</mi></mrow><annotation encoding="application/x-tex">t</annotation></semantics></math></span> is elapsed time, and <span class="katex"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>S</mi></mrow><annotation encoding="application/x-tex">S</annotation></semantics></math></span> is the current memory stability. Decay is biology. The schedule of reviews is not.</p>