Prooftoys syntax quick reference
For more complete and precise information, see the full reference.
Logic operators
| Concept | English | Symbol | Text entry |
|---|---|---|---|
| Untrue | not | not |
not |
| At least one true | or | | |
| |
| Both true | and | & |
& |
| Conditional | implies | => |
=> |
| Equivalent | == |
== | |
| True for all | for all | forall |
forall |
| True for some | exists | exists |
exists |
Precedence of infix operators in order from highest to lowest,
is &, |, =>, ==.
The rest are functions, which bind tighter than
infix operators, so not a & b means the same as (not a) & b.
Basic math
Basic binary math operations are: +, -, *, /,
** (exponentiation). Exponentiation has the highest precedence,
followed by multiplication and division, followed by addition and
subtraction. The negative of a number is expressed by the function
neg, which displays as a prefix -.
Variables and constants
Variable names have a single alphabetic character, such as x or A.
The single letter may be followed by digits or a single underscore and
then digits. A variable name may also begin with $, but these are
mainly intended to be introduced by the system.
Names with multiple alphabetic characters are always constants, and may also include digits.
The characters ".", “,”, “(”, “{”, “[" are reserved as parts of the syntax. Sequences of characters that are not letters or digits and not reserved for the syntax are also constants.