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At a time when Florida is banning the acknowledgment of gender fluidity or any identity outside male and female, this subversive textbook unabashedly tells suggestible children that such things exist as “reciprocal identities,” “cofunction identities,” “additive identity property” and even “multiplicative identity property.”

The number 1 in its multiplicative identity is practically bedridden, leaving other numbers unchanged: 6 times 1 equals 6.