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High Quality Content by WIKIPEDIA articles! A pencil is a family of geometric objects, such as...
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High Quality Content by WIKIPEDIA articles! The Penrose triangle, also known as the Penrose...
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High Quality Content by WIKIPEDIA articles! In mathematical physics, the Penrose transform, named...
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High Quality Content by WIKIPEDIA articles! A pentatope number is a number in the fifth cell of...
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High Quality Content by WIKIPEDIA articles! In geometry, a pentagonal hexecontahedron is a...
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High Quality Content by WIKIPEDIA articles! In five-dimensional geometry, a pentacross, also...
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High Quality Content by WIKIPEDIA articles! In geometry, the pentagonal bipyramid (or dipyramid)...
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High Quality Content by WIKIPEDIA articles! In recreational mathematics, a polyform is a plane...
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High Quality Content by WIKIPEDIA articles! In chemistry a pentagonal bipyramid (or dipyramid) is...
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High Quality Content by WIKIPEDIA articles! A pentagonal pyramidal number is a figurate number...
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High Quality Content by WIKIPEDIA articles! In geometry, two triangles are perspective (or...
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Why do railway tracks appear to meet at the horizon? Why do circles appear flattened when seen at...
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High Quality Content by WIKIPEDIA articles! In the mathematical field of graph theory, the...