two envelopes problem

brain teaser, puzzle, or paradox in logic, probability, and recreational mathematics
Thing mathematical_problem Q180191
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two envelopes problem

Summary

two envelopes problem is a mathematical problem[1]. It draws 237 Wikipedia views per month (mathematical_problem category, ranking #20 of 128).[2]

Key Facts

  • two envelopes problem's instance of is recorded as mathematical problem[3].
  • two envelopes problem's Freebase ID is recorded as /m/07lvb4[4].
  • two envelopes problem's defining formula is recorded as {1 \over 2} (2A) + {1 \over 2} \left({A \over 2}\right) = {5 \over 4}A[5].
  • two envelopes problem's BabelNet ID is recorded as 01886854n[6].
  • two envelopes problem's PhilPapers topic is recorded as two-envelope-paradox[7].
  • two envelopes problem's maintained by WikiProject is recorded as WikiProject Mathematics[8].
  • two envelopes problem's Microsoft Academic ID is recorded as 2778679712[9].

Why It Matters

two envelopes problem draws 237 Wikipedia views per month (mathematical_problem category, ranking #20 of 128).[2] It has Wikipedia articles in 13 language editions, a strong signal of global cultural recognition.[10] It is known by 6 alternative names across languages and contexts.[11]

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). two envelopes problem. Retrieved May 3, 2026, from https://4ort.xyz/entity/two-envelopes-problem
MLA “two envelopes problem.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/two-envelopes-problem.
BibTeX @misc{4ortxyz_two-envelopes-problem_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{two envelopes problem}}, year = {2026}, url = {https://4ort.xyz/entity/two-envelopes-problem}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): two envelopes problem — https://4ort.xyz/entity/two-envelopes-problem (retrieved 2026-05-03)

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