V vs Calculator xy

Build and observe to come true with figures of repulsion, geometry, angles. V-SPER, free application, is a support for the teaching of the VSPER theory (Valence Shell Electron Pair Repulsion). This theory makes it possible to predict the geometry of molecules from the sole electrostatic repulsion of valence electron pairs. It is based on the Lewis model of distribution of the valence electrons of the atoms concerned. The latter is a prerequisite to take full advantage of V-SPER. The molecule is denoted AXnEm. The atoms (or portions of molecules) linked to the central atom A are denoted X (n: number of X, whether they are linked by single or multiple bonds). The non-bonding electron pairs belonging to the central atom A and not being involved in bonds are denoted E (m: number of E). V-SPER allows to build simple and 3D objects (molecules) and to display the repulsion figure in blue (FigREP), the molecular geometry in yellow (Geom) as well as the angles. Some angles are just modeled and do not always correspond to experimentally measured angles, such as the relative lengths of single or multiple bonds

Calculator xy is a full-featured scientific calculator built for students, engineers, and professionals who need real calculating power — not just a phone app that looks like a calculator. Every screen uses a genuine button-pad layout, just like a handheld scientific calculator, so nothing feels out of place. No pop-up menus, no text boxes — just press and calculate, the way a real calculator should work. KEY FEATURES • Natural Textbook Display — Enter fractions, roots, powers, and integrals exactly as they appear in your textbook, and see results the same way. • Equation Solver — Solve linear and simultaneous equations with multiple unknowns in seconds, with full step-by-step input. • Matrix & Vector Calculations — Add, multiply, transpose, find determinants and inverses with ease, up to large matrix sizes. • Statistics Mode — Single and paired-variable statistics, linear/quadratic regression, standard deviation, and more. • Complex Numbers — Perform arithmetic in rectangular and polar form, with conversions between the two. • Base-N Calculations — Convert and calculate in DEC, HEX, BIN, and OCT, ideal for programming and computer science. • Table & Graphing Mode — Generate value tables and visualize functions to understand their behavior at a glance. • Unit Conversion & Scientific Constants — Built-in reference values and converters for physics, chemistry, and engineering. • Memory Functions — Store, recall, and accumulate values across calculations without losing your place. • Multiple Languages — Available in English, Arabic, Spanish, French, German, Portuguese, Russian, Chinese, Japanese, Korean, Italian, Turkish, and more. • Customizable Themes — Choose the calculator color and style that suits you and your device. PREMIUM FEATURES Unlock cloud sync to back up and access your calculation history across all your devices, unlimited graphing for advanced functions, and exclusive additional themes — all with a simple subscription. WHY CALCULATOR XY • Designed to feel exactly like a physical scientific calculator, with a real button pad on every screen • Fast, accurate, and reliable results for exams, homework, and professional work • No clutter, no unnecessary permissions, no distractions — just a calculator that works • Regularly updated with new modes and improvements PERFECT FOR • High school and university students preparing for exams • Engineers and scientists who need quick, precise calculations • Anyone who prefers the familiar feel of a real scientific calculator over a generic app Whether you're studying for an exam, working through engineering problems, or just need a calculator that actually feels like one, Calculator xy delivers a fast, accurate, and familiar experience — right on your iPhone. Download Calculator xy today and calculate with confidence. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/