Get an iPad, and load up Carnets (Jupyter Notebooks), a-Shell and/or iSH, which are linux environments, or maybe PocketCAS (not sure why I chose that from the C

Get an iPad, and load up Carnets (Jupyter Notebooks), a-Shell and/or iSH, which are linux environments, or maybe PocketCAS (not sure why I chose that from the CAS apps) For reading books and papers, pdf is natively supported in the files app. Mini-rant Epub books are supported in Apple Books, formerly iBooks, but I 100% prefer to manage my books as regular files, just like on the mac. You can get Epub readers for iPad, for this purpose. Or, just use Calibre on a desktop to convert Epubs to pdf.