Hi, Need your help to unravel the claims made by a poster in my local forum, if it has any merits. I do not have the expertise to evaluate his claims but am hoping if you can give me a few points on his line of reasoning, if it is faulty or not. I have a general background in undergraduate physics. Thanks in advance. This is the website where the detail of the claims can be found [Link deleted by mentor] The author posted this in my local forum, https://forum.lowyat.net/topic/4213664 By Chan Rasjid "I have written a short 5-page paper that explains simply why Einstein's special relativity is not a valid theory in physics. It could be downloaded as a pdf file from my website. "The Lorentz Transformation Cannot Be Physical" pages :5 [Link deleted by mentor] Abstract. "The Lorentz transformation will always remain only as an abstract mathematical transformation that cannot be incorporated into any theory of physics. The reason being there is no natural principle that a mathematical transformation carries over association of physical units with real numbers from the domain space to the image space. Any application of the Lorentz transformation will only result in space and time that have no relation to our physical world. All physical theories founded on the Lorentz transformation are invalid. These include Einstein’s special relativity, particle physics, electromagnetism of the Maxwell-Heaviside equations." Best regards, Chan Rasjid.