Metric properties of semialgebraic mappings

We give an effective estimation from above for the local {\L}ojasiewicz exponent for separation of semialgebraic sets and for a semialgebraic mapping on a closed semialgebraic set. We also give an effective estimation from below of the {\L}ojasiewicz exponent in the global separation for semialgebraic sets and estimation of the {\L}ojasiewicz exponent at infinity of a semialgebraic mapping similar to the Jelonek result in the complex case.