Pure Mathematics for Theoretical Computer Science PMTCS 2995-3162 10.54216/PMTCS https://www.americaspg.com/journals/show/2543 2023 2023 Mustansiriah University, Department of Mathematics, Iraq Murhaf Murhaf The main goal of this study is to obtain a direct theorem for the simultaneous approximation of 3 monotone functions in  by splines in the space . Also, we have illustrated many examples to clarify the validity of our work. 2024 2024 08 14 10.54216/PMTCS.030101 https://www.americaspg.com/articleinfo/40/show/2543