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Definition 2 A homeomorphism between topological spaces \(X\) and \(Y\) is a bijective map \(f: X \to Y\) such that both \(f\) and its inverse \(f^{-1}: Y \to X\) are continuous. Explicitly:
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ВС России впервые ударили по Краматорску ствольной артиллерией. Атака пришлась на северо-восточные окраины города, об этом рассказал военный корреспондент ВГТРК, Герой России Евгений Поддубный в Telegram-канале.
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What are Moon phases?According to NASA, the Moon takes about 29.5 days to orbit the Earth. Over the course of this period, it moves through eight recognisable phases. While the same side of the Moon always faces us, the amount of its surface lit by the Sun changes as it continues along its path. The shifts in sunlight create the different appearances we see from Earth, ranging from a fully illuminated Moon to a thin sliver or near darkness. The eight phases are:
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