For example, if we use the rule:
on the goal to be proved
We will obtain successively
The proof kernel produces the following messages:
krt: sequence memory short krt: asking for 1500000 int, waiting for system reply... krt: OK, memory obtained, we continue. krt: sequence memory short krt: asking for 2249997 int, waiting for system reply... krt: OK, memory obtained, we continue. krt: sequence memory short krt: asking for 3374992 int, waiting for system reply... krt: OK, memory obtained, we continue. ...
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The messages krt: sequence memory short are generated by the kernel which dynamically allocates the lacking memory.
This example is simple. Loops may occur for groups of rules and may be a priori more difficult to detect.