Yes, except the lemon may cause excessive seeds in the mandarin. It is generally recognised that cross pollination of flowers (from any lemon tree) will set more pips in mandarins and other citrus fruit. Without attempting too much science, the bees will carry pollen from the lemon to other citrus trees in flower, so unless the trees are outside bee flying distance (several hundred meters by my understanding) apart, there is no stopping this act of nature. Neighbours lemon trees create an extra problem here as well. If you can put as much distance and as many obsticles (houses, fences, garage, trees) between your lemon and other citrus trees you will have done all you can.
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