Type mathematics as you write it • 2x, 3(x + 1), sin x, sin^2 x, |x|, x = 2 and e are read as meant, and an open bracket is closed for you. • Text that cannot be read is explained in plain words, and stays in its field so you can fix it. New in the menus • Differentiate, Integrate, Solve for and Substitute in the Transform menu, each asking for its variable. • The palette: fractions, roots, integrals, sums, limits and matrices as buttons, at the caret or around the selection. • After you pick an action, the screen scrolls back to the formula so you see the result. A tidier menu (≡) • New session… at the top. • Sessions, Add-ons and File each open in a window of their own. • Search your sessions by name or by the formula they hold, and search the add-ons. • Everything you export — the formula, the history as Python, the history as a web page — can be saved to Files or shared with another app. On the iPhone the formula comes first • The session row stays at the top, the LaTeX and pen tools sit right above the formula, and the editing tools come under it. • The edit tools are now icons; touch and hold any button to see what it does. • The Python form of the formula is coloured, shows matching brackets, folds away when you don't need it, and has its own undo. • The status line names the selected part in bold, with its Python form beside it. Handwriting • Erasing strokes and Clear ink are now steps that Undo and Redo walk through. Twelve new add-ons (experimental) Switch them on in ≡ → Add-ons: step-by-step solutions for integrals, derivatives and equations, Check my work, Export (LaTeX, MathML, Python, C, Fortran, JavaScript, Octave, Julia, Rust), Solve, Assumptions, Values at any precision, Series, Units, Linear algebra, Transforms (Laplace, Fourier, Mellin, Hankel, z), Forms (every simplification side by side) and Feynman diagrams, drawn as on paper. They are marked Experimental and start off. Also • Better support for the keyboard and VoiceOver: menus and windows behave as dialogs, and every button has a name. • Nothing you type is lost while a computation is still running. • Many smaller fixes. As always, everything runs on your device: no account, no network, nothing leaves your iPhone or iPad.

What's new in 0.1.2 HANDWRITING • Write a formula with your finger or Apple Pencil and have it read into the expression. Recognition runs entirely on your device. • Writing near the edge of the formula area now opens more room, to the right and downwards, so you can keep going. • Switching the pen off clears any strokes you did not apply. A CALMER SCREEN • The four arrows now sit in a row just under the formula, with the keyboard button at the right. It blinks when a selection or a caret appears, to show you can type there. • Inside a matrix, the row and column buttons join that row. • The bar that popped up under every selection is gone. Edit, Unwrap, Delete, Isolate, Copy and Paste each have one fixed place in the tools. TYPING LANDS WHERE THE CARET IS • Text typed in front of a term now joins that term: with the caret before the 1 of x + 1, typing r gives x + r. • A caret outside a function call such as f(x, y) multiplies the whole call instead of typing into its arguments. CLEARER ANSWERS • After a LaTeX or handwritten reading is applied, Keep is green and Undo the change is red, matching the colours of the change shown above them. YOUR WORK IS SAFER • The last edit is kept even if the app is closed a moment later. • Two windows no longer overwrite each other's sessions. • A session that cannot be opened stays in the list instead of disappearing. • Opening a saved .sympy file never runs code from it, and files holding enormous numbers no longer freeze the app. • Interrupt stops only the computation it was pressed for. ALSO • Open formula, Save formula and the history exports are always available from the ≡ menu. • Many fixes in the Plot, Expression tree, Rewrite rules, Console and LaTeX add-ons. • As before, the app works fully offline: nothing leaves your device.

SymPy Editor 0.1.1 The first release with add-ons, and a lot of work on how the editor feels under a finger. ADD-ONS Four add-ons ship with the app. Switch them on and off from the top of the ≡ drawer; the app remembers what you left on. • Expression tree: the formula as a tree you can tap, edit and drag, with a tree for every step of the history. • Plot: the graph of the selection, with pinch, drag and zoom on both axes. • Rewrite rules: rules with wildcards, kept in named rule sets between sessions. • LaTeX: type or paste LaTeX; every ambiguous part is offered as a choice instead of being guessed. EDITING • Matrices and arrays: add and remove rows and columns, drag the corner grip to reshape, and move through the entries with the arrows as they are drawn. • Templates: \int, \sum, \prod, \lim, \frac, \binom, \matrix and more build the whole construction with empty boxes to fill; Tab moves between them. • Operators can be selected and replaced: pick the + or = and type another. • Selecting with a finger: a long press starts a range, dragging past the edge scrolls and keeps selecting, and the toolbar no longer flickers while you drag. • A refused edit says why, and the formula flashes red. • Allow invalid: an optional switch keeps what SymPy would refuse (a product of matrices whose shapes don't match) as a red node until you fix it. FILES AND SESSIONS • Save a formula as a .sympy file and open it again with the app, history included. • The history can be exported as a page or as a Python script. • Sessions that could not be reopened before now open. FIXES • Long computations can be interrupted. • Pinch-zoom only zooms the formula, the plot and the tree, never the whole app; the page scrolls only up and down, and the formula scrolls sideways. • The LaTeX add-on no longer freezes on first use, and no longer reports half-typed LaTeX as an error. • The formula no longer flashes the wrong expression while the last session reopens. • Many smaller fixes to selection, the caret, the history and the guides behind every "?". PRIVACY The app works entirely offline: it carries its own Python and SymPy, and nothing you write leaves your device.