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A strong inequality in which a is not only less than b, but much less (by some convention) is denoted a<<b.

The relationship x precedes y is written x≺y. The relation x precedes or is equal to y is written x<=y.

The symbol p^e∥n means, for p a prime, that p^e|n, but p^(e+1)n.

In general, the opposite of trivial.

The word "spectrum" confusingly has a number of unrelated meanings in various branches of mathematics.

The relationship x succeeds (or follows) y is written x≻y. The relation x succeeds or is equal to y is written x>=y.

An alternative spelling of the name "Chebyshev."

Brun's sieve was refined by J. B. Rosser, G. Ricci, and others.

The graph corresponding to the complete k-ary tree on n nodes is implemented in the Wolfram Language as KaryTree[n, k].

Starr roses are attractive geometric figures such as those illustrated above.