The secondary diagram arrows are those which are oriented in the secondary directions of the compass-card; here are thus the possible directions and the corresponding abbreviations:
ll
north-east ( +ne+ )&south-east ( +se+ )
north-west ( +nw+ )&south-west ( +sw+ )
The variety of available arrows is the same as for primary arrows: plain arrow (+ar+), dotted arrow (+dotar+), monomorphism (+mono+), epimorphism (+epi+), bimorphism (+bimo+), isomorphism (+iso+), pair of parallel arrows (+biar+), equality (+eql+) and pair of adjoint arrows (+adjar+). Just as for primary arrows, a secondary arrow is obtained by typing the abbreviation for its direction followed by the abbreviation for the type of arrow. For example the command ++ will produce a pair of sout-west pointing arrows. Here are some examples of what you can produce as secondary diagram arrows:
&bull#bullet; &bull#bullet; &bull#bullet; J &bull#bullet; &bull#bullet; &bull#bullet; &bull#bullet; &bull#bullet; &bull#bullet;
The case of a pair of adjoint arrows requires again a comment. The direction is always that of the lower arrow.
The secondary diagram arrows have a standard horizontal extent equal to 58pt.