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Geometric Calculator  Reference
The Geometric calculator works like a Hewlett Packard reverse
polish notation calculator.
The calculator has a stack of four values: a, b,
c, and t. a is displayed in a window above
the keyboard, and b is displayed in a window above
a. The values of c and t can be viewed
by rotating the stack with the <<< key.
Numbers are entered into a using the numerical digits,
the ., the E, the +/, the x, the
y, the z, and the ENTER keys. The
backspace, < , key can be used to correct errors.
The other keys perform operations on the stack, either replacing
a with a new value, replacing a and b with
a new value, moving stack elements around, or clearing the stack.
Here are the definitions of the calculator keys from left to
right and from top to bottom.
 Store a into a register. 
 Recall a from a register. 
 Cosine of a. 
 Sine of a. 
 Tangent of a. 
 Unassigned. 
 Unassigned. 
 Copy c into t, b into
c, and a into b. 
 Exchange a and b. 
 Rotate the stack downwards. 
 Erase the last character entered, or clear the calculator. 
 Replace a with its multiplicative inverse. 
 Divide a by its magnitude. 
 Clear the calculator. 
 Enter the x basis into a. 
 Enter a 7 into a. 
 Enter an 8 into a. 
 Enter a 9 into a. 
 Divide b by a. 
 Inner product of b and a. 
 Replace a with its grade 0 part, ie its scalar part. 
 Replace a with its grade 1 part, ie its vector part. 
 Enter the y basis into a. 
 Enter a 4 into a. 
 Enter a 5 into a. 
 Enter a 6 into a. 
 Geometric product of b and a. 
 Outer product of b and a. 
 Replace a with its grade 2 part, ie its bivector part. 
 Replace a with its grade 3 part, ie its trivector part. 
 Enter the y basis into a. 
 Enter a 1 into a. 
 Enter a 2 into a. 
 Enter a 3 into a. 
 Subtract a from b. 
 Replace a with its reverse, or conjugate. 
 Replace a with its even grade part. 
 Replace a with its odd grade part. 
 Change the sign of a, or of a's exponent. 
 Enter a 0 into a. 
 Enter a decimal point into a. 
 Enter a power of ten exponent a. 
 Add a to b. 
 Replace a with its magnitude. 
 The product of b a b. 
 The product of b a b*. 
