Editing Mesechtas Terumot (section)

==== Mixture in the Object or in the Person ====
The Rebbe resolves and explains that Rabbi Eliezer, Rabbi Yehoshua, and Rabbi Akiva disagree about the general definition of nullification in a dry-in-dry mixture - which is unlike a wet-in-wet mixture, which is a real mixture where they become one reality that cannot be separated. Different from this is a dry-in-dry mixture where each remains separate, except that a person doesn't know where the forbidden item is. We can explain the nature of this mixture in two ways:

'''A)''' The nature of a dry-in-dry mixture is indeed different from a wet-in-wet mixture, as it is not a mixture in the object itself but '''only from the perspective of the person''', meaning in a person's knowledge there is a mixture of forbidden and permitted, but this is enough to nullify the prohibition.

'''B)''' Even a dry-in-dry mixture is '''in the object itself''', because the definition of "mixture" is that one cannot distinguish between the permitted and forbidden.

This is the reason for the disagreement between Rabbi Eliezer (who forbids) and Rabbi Yehoshua and Rabbi Akiva: Rabbi Eliezer holds that even the definition of a dry-in-dry mixture needs to be in the object itself, and therefore he holds that the white figs cannot elevate the black ones (and vice versa), since there is no mixture in reality, and as mentioned above in Tosafot's language, they cannot mix because they are always recognizable as separate.

But Rabbi Yehoshua and Rabbi Akiva hold that for a dry-in-dry mixture, it is sufficient when it is only from the perspective of the person - in the person's knowledge. This is also Rabbi Akiva's reasoning for holding that "when it is not known what fell, they elevate each other" - because of the mixture in the person's knowledge, and in this case, in his knowledge they are mixed in all one hundred.

Based on this, the Rebbe also explains Rabbi Yehoshua's reasoning that all combine to nullify it because "if one wanted, he could crush and mix them all together" (even though he did not crush and mix them): Crushing figs is (not just in the category of "if one wanted" generally, but this is) the common way for everyone to crush figs; and since a dry-in-dry mixture is the mixture in the knowledge and thought of the person, Rabbi Yehoshua holds that since it is common and therefore in one's desire to crush the figs, in the person's will (and thought) he does not separate and divide between the black and white ones, and therefore there is a mixture of all one hundred in the will and thought of the person.
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