ZZZ HostLink vs DB RelationalAlgebra

ZZZ HostLink turns your iPhone into a remote terminal for your computer. Connect over SSH, Wi-Fi (TCP), or BLE and operate your PC's shell with a VT100/ANSI-compatible console, soft keyboard input, and a control-key bar (Esc, Tab, Ctrl-C/D, arrows, and more). FEATURES - SSH: interactive shell with PTY. Password or key auth (OpenSSH ed25519 / RSA). - Wi-Fi / BLE: connect to your PC using the companion bridge script. - VT100/ANSI terminal with horizontal scrolling and copy by long-press. - Direct input mode: type straight into the console. - Save SSH server connections securely in the Keychain. PREMIUM (subscription) - Free: save 1 SSH server. - Pro: save unlimited SSH servers. NOTES - For Wi-Fi / BLE, run the companion PC script: https://github.com/smozume/ble-remote-terminal - iOS cannot act as a Bluetooth keyboard/mouse, so this app is a remote terminal only. - Host key verification is not yet implemented; use on trusted networks. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://smolt-stage.com/home/privacy/zzz-hostlink-privacy-policy-ios-en.html

A native iPad and iPhone app that converts a SQL query typed, pasted, or imported from a .sql file into relational algebra, tuple relational calculus and domain relational calculus. Each notation gets a step by step derivation, a final oneline formula, and an interactive diagram an operator tree for the algebra, a quantifier scope tree for the calculus and a fourth view stacks all three against the same query. Whatever SQL asks for that a notation cannot express exactly is reported rather than quietly approximated.