Example image of eyePlorer eyePlorer map for 'Parallel postulate': Axiom Euclid Euclid's Elements Euclidean geometry Geometry Line (geometry) Line segment Right angle Non-Euclidean geometry Absolute geometry Conversion (logic) Elliptic geometry Angle Triangle Internal and external angle John Playfair Mathematician Parallel (geometry) Self-evidence Unconscious mind Congruence (geometry) Similarity (geometry) Circumscribed circle Quadrilateral Distance Pythagorean theorem Right triangle Area Saccheri quadrilateral Proclus Alhazen Hyperbolic motion Mathematics in medieval Islam Reductio ad absurdum Transformation (geometry) Lambert quadrilateral Hyperbolic geometry Omar Khayyám Giovanni Girolamo Saccheri Nasir al-Din al-Tusi Consistency Nikolai Lobachevsky János Bolyai Carl Friedrich Gauss Farkas Bolyai Bernhard Riemann Henri Poincaré Spherical geometry Eugenio Beltrami Independence (mathematical logic)
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