In mathematics, the horizontal line test is a test used to determine whether a function is injective (i.e., one-to-one).
Read more about Horizontal Line Test: Horizontal Line Test in Calculus, Horizontal Line Test in Set Theory
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“True. There is
a beautiful Jesus.
He is frozen to his bones like a chunk of beef.
How desperately he wanted to pull his arms in!
How desperately I touch his vertical and horizontal axes!
But I can’t. Need is not quite belief.”
—Anne Sexton (1928–1974)
“I love them
for finding what
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and for loving me
for the line I wrote,
and for forgetting it....”
—Denise Levertov (b. 1923)
“It is the test of a novel writer’s art that he conceal his snake-in-the-grass; but the reader may be sure that it is always there.”
—Anthony Trollope (1815–1882)