• The line is concave down ( ward ) , up ( ward ).
• Downwardly ( or Upwardly ) concave ...
• The line is concave down ( ward ) , up ( ward ).
• Downwardly ( or Upwardly ) concave ...
Циммерман М., Веденеева К.. Русско-Английский научно-технический словарь переводчика. Russian-English scientific dictionary for translators. 2012