For each of the last two years, we’ve released sets of “Download and Print” cards for Valentine’s day. The 2013 set had six equation-heavy cards, and the 2014 set was a set of six symbol-heavy cards. This year, we’re releasing six new cards, bringing the collection up to a total of 18 cards. This year’s new cards feature love, hearts, and arrows (but no bows or cupids):

*For when your love is complex, but not whatsoever imaginary.*

For that moment when you want to express that not only is the first derivative of your love positive, but *so is the second*.

(Just in case there was a danger of none of these being sufficiently cheesy.)

Not sure how we missed this one in last year’s set of symbols. Alternate caption: “You light up my life.”

*And what better way to say “I love you,” than with the gift of a math problem?*

You can download the full set here, which includes all 18 designs from the three years (a 765 kB .PDF document).

As usual, print them out on (or otherwise affix to) card stock, and [some steps omitted] enjoy the resulting lifelong romance.

**Update:** **New cards have been released!** Please check out the 2019 set, which contains all 42 cards from 2013 through 2019.