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2. Notre-Dame de Paris - Wikipedia

   en.wikipedia.org/wiki/Notre-Dame_de_Paris

   Notre-Dame de Paris (French: [nɔtʁ (ə) dam də paʁi] ⓘ; meaning " Our Lady of Paris "), often referred to simply as Notre-Dame, [a] is a medieval Catholic cathedral on the Île de la Cité (an island in the River Seine), in the 4th arrondissement of Paris, France. The cathedral, dedicated to the Virgin Mary, is considered one of the finest examples of French Gothic architecture. Several ...

3. Zoroastrianism - Wikipedia

   en.wikipedia.org/wiki/Zoroastrianism

   Zoroastrianism (Persian: دین زرتشتی, romanized: Din-e Zartoshti), also known as Mazdayasna and Behdin, is an Iranian religion. Among the world's oldest organized faiths, it is based on the teachings of Iranian prophet Zarathustra—commonly known by his Greek name Zoroaster —as set forth in the primary religious text called the Avesta. Zoroastrians exalt an uncreated and benevolent ...

4. Eigenvalues and eigenvectors - Wikipedia

   en.wikipedia.org/wiki/Eigenvalues_and_eigenvectors

   Eigenvalues and eigenvectors. In linear algebra, an eigenvector (/ ˈaɪɡən -/ EYE-gən-) or characteristic vector is a vector that has its direction unchanged by a given linear transformation. More precisely, an eigenvector, , of a linear transformation, , is scaled by a constant factor, , when the linear transformation is applied to it: .

5. Gray code - Wikipedia

   en.wikipedia.org/wiki/Gray_code

   A Gray code absolute rotary encoder with 13 tracks. Housing, interrupter disk, and light source are in the top; sensing element and support components are in the bottom. Gray codes are used in linear and rotary position encoders (absolute encoders and quadrature encoders) in preference to weighted binary encoding.