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EVIDENCE MAP

See where ideas were written, taught, and moved

This is a real map of high-certainty events—not a map of where an idea was “born.” Open a pin to see exactly what happened, why the place is shown, and which source supports it.

12 places · 23 pinned events · 44 events kept off-map

Interactive event mapPin size reflects event count, not importance.
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SELECTED PLACE

Jena

50.928, 11.588 · 1892 CE

Teaching and appointment
Why this place matters: 1 source-backed event connect writing, publication, translation, teaching, or reception to this exact place. The pin does not claim the idea originated here.
  1. 1892Teaching and appointment

    Frege teaches and works at Jena; this marker does not identify the place where the article was written or published.

    Gottlob FregeOn Sense and Reference
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    The source supports this event-place association, not the truth of the philosophy.

    • Gottlob Frege

      Stanford Encyclopedia of Philosophy

      Locator: Life and academic career at Jena

      Open source

    • Geschichte des Instituts für Philosophie

      Friedrich Schiller University Jena · Institutional history of philosophy at Jena

      Locator: Institutional history: Frege’s work at Jena

      Open source
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Browse every verified place

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  3. Cambridge

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  4. Cambridge, MA

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  5. Chicago

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  6. Copenhagen

    1 evidence-backed events · 1 thinkers · 1 works

  7. Jena

    1 evidence-backed events · 1 thinkers · 1 works

  8. London

    2 evidence-backed events · 2 thinkers · 2 works

  9. New York

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  10. Oxford

    2 evidence-backed events · 2 thinkers · 2 works

  11. Paris

    4 evidence-backed events · 3 thinkers · 4 works

  12. Princeton

    1 evidence-backed events · 1 thinkers · 1 works