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| | A propositional expression of this form can be read as follows: | | A propositional expression of this form can be read as follows: |
| | | | |
| − | <pre> | + | {| align="center" cellpadding="8" width="90%" |
| − | IF:
| + | |<math>\operatorname{If}</math> |
| | + | |- |
| | + | | At the time <math>p_i,\!</math> the tape cell <math>r_j\!</math> bears the mark <math>s_k,\!</math> |
| | + | |- |
| | + | | <math>\operatorname{But}</math> it is not the case that: |
| | + | |- |
| | + | | At the time <math>p_i,\!</math> the tape head is on the tape cell <math>r_j,\!</math> |
| | + | |- |
| | + | | <math>\operatorname{Then}</math> |
| | + | |- |
| | + | | At the time <math>p_{i+1},\!</math> the tape cell <math>r_j\!</math> bears the mark <math>s_k.\!</math> |
| | + | |} |
| | | | |
| − | At the time p<i>, the tape cell r<j> bears the mark s<k>,
| + | The eighteen clauses of the Interaction Conditions simply impose one such constraint on symbol changes for each combination of the times <math>p_0, p_1,\!</math> registers <math>r_0, r_1, r_2,\!</math> and symbols <math>s_0, s_1, s_\#.\!</math> |
| − | | |
| − | BUT it is NOT the case that:
| |
| − | | |
| − | At the time p<i>, the tape head is on the tape cell r<j>,
| |
| − | | |
| − | THEN:
| |
| − | | |
| − | At the time p<i+1>, the tape cell r<j> bears the mark s<k>.
| |
| − | </pre>
| |
| − | | |
| − | The eighteen clauses of the Interaction Conditions simply impose one such constraint on symbol changes for each combination of the times <math>p_0, p_1,\!</math> registers <math>r_0, r_1, r_2,</math> and symbols <math>s_0, s_1, s_\#.\!</math> | |
| | | | |
| | ===Transition Relations=== | | ===Transition Relations=== |