As a former technical writer, I suggest that the "math is prose" rule is valid only under the assumption of mathematically minded readers. To normal people, an

As a former technical writer, I suggest that the "math is prose" rule is valid only under the assumption of mathematically minded readers. To normal people, an equation or other mathematical expression might as well be one of those black blocks in a redacted government document. How are they supposed to know that a set membership symbol or a logical implication arrow should be read as a verb? It's not much extra effort to treat expressions as nouns by writing "we conclude that p -> q holds whenever x and y are the same" instead of "we conclude p -> q iff x = y", and doing so may make the difference for some readers between missing a few details and feeling completely excluded.