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It is shown that formally regular solutions in 5D Kaluza-Klein gravity havesingularities. This phenomenon is connected with the existence of a minimallength in nature. The calculation of the derivative of the $G_{55}$ metriccomponent leads to the appearance of the Dirac's $\delta-$function. In thiscase the Ricci scalar becomes singular since there is a square of thisderivative.Comment: changes in the tex

PHYSICAL SINGULARITY IN THE REGULAR SPACE–TIME AND FUNDAMENTAL LENGTH