Last Updated：2025/12/19
Sentence
The
new
CA
is
a
modification
of
Fredkin's
earlier
SALT
architecture
in
which
every
cell
is
identified
as
either
even
or
odd
-
as
in
sodium
and
chlorine
in
a
salt
crystal
hence
the
name.
The
state
of
each
cell
is
either
up
or
down
and
the
development
rule
simple
takes
account
of
states
of
odd
and
even
neighbours.
The
up-date
at
each
time
step
simply
takes
the
form
of
a
swap
of
the
states
of
diagonally
related
cells.
SALT
CAs
are
reversible
and
capable
of
universal
computation
and
are
conjectured
to
be
capable
of
universal
construction
in
the
sense
of
Von
Neumann.
Quizzes for review
The new CA is a modification of Fredkin's earlier SALT architecture in which every cell is identified as either even or odd - as in sodium and chlorine in a salt crystal hence the name. The state of each cell is either up or down and the development rule simple takes account of states of odd and even neighbours. The up-date at each time step simply takes the form of a swap of the states of diagonally related cells. SALT CAs are reversible and capable of universal computation and are conjectured to be capable of universal construction in the sense of Von Neumann.
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