# (calc.info)Algebra

12 Algebra
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This section covers the Calc features that help you work with algebraic
formulas. First, the general sub-formula selection mechanism is
described; this works in conjunction with any Calc commands. Then,
commands for specific algebraic operations are described. Finally, the
flexible "rewrite rule" mechanism is discussed.
The algebraic commands use the `a' key prefix; selection commands
use the `j' (for "just a letter that wasn't used for anything else")
prefix.
**Note:** Editing Stack Entries, to see how to manipulate formulas
using regular Emacs editing commands.
When doing algebraic work, you may find several of the Calculator's
modes to be helpful, including algebraic-simplification mode (`m A') or
no-simplification mode (`m O'), algebraic-entry mode (`m a'), fraction
mode (`m f'), and symbolic mode (`m s'). **Note:** Mode Settings, for
discussions of these modes. You may also wish to select "big" display
mode (`d B'). **Note:** Normal Language Modes.

- Selecting Subformulas
- Algebraic Manipulation
- Simplifying Formulas
- Polynomials
- Calculus
- Solving Equations
- Numerical Solutions
- Curve Fitting
- Summations
- Logical Operations
- Rewrite Rules

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