This paper will show how the philosopher Maṇḍanamiśra discusses in his Brahmasiddhi the cancellation of a former element by a latter, which is prescribed in Mīmāṃsāsūtra 6.5.54. We do not have yet a clear idea of what the value of this text holds for him. I would emphasize that probably more than we had expected, it forms an essential part of Maṇḍana’s philosophy. Its authority is sometimes stated explicitly and sometimes not; and we easily overlook the fact that his argument (...) is highly dependent on the Mīmāṃsā scheme. This rule, 6.5.54, was originally purely concerned with the performance of the sacrifice, but Maṇḍana applies it to his epistemic analysis, i.e. his discussion on the relative strength of the valid means of knowledge, giving this rule the status of basic testimony. Furthermore, he interprets the rule in his own unique way, or at least differently from Kumārilabhaṭṭa, integrating it with the argument by his famous predecessor Bhartṛhari. The mutual relationship among Maṇḍana, Kumārila, and Bhartṛhari, will be illuminated by focusing on what Mīmāṃsāsūtra 6.5.54 really means. (shrink)