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Submetric Spaces — Part I 1
(1) For all elements x, y of R such that 0≤ x and 0≤ y holds max(x,y)≤ x+ y. (2) For every metric space M and for all elements x, y of M such that x 6= y holds 0 < ρ(x,y). (4)1 For all elements x, y of { / 0} such that x = y holds ({[ / 0, / 0]} 7→ 0)(x, y) = 0. (5) For all elements x, y of { / 0} such that x 6= y holds 0 < ({[ / 0, / 0]} 7→ 0)(x, y). (6) For all elements x, y of { / 0} holds (...
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