• 1)  Each lab is to be submitted to me via e-mail on its due date before class (or earlier). If you are part of a group (i.e., two or three students) who have worked together, only one copy of the lab should be submitted (by either of you). Note that it is the responsibility of the group members to work out details of who submits the lab. No points will be credited back to a student in a group whose partner has failed to submit a joint work on time. That is, all members of a group will always receive the same score, regardless of any possible circumstances.
  
• 2)  Late submissions on the due day (i.e., until midnight) will be graded out of 80%, and submissions between then and up to two days (= 48 hours) past the deadline will be graded out of 50%, provided that you contact me before the submission deadline and ask for an appropriate extension. See the Example below. Any later submissions, or submissions without a prior request for a two-day extension, will not be graded, unless I give you an individual extension due to some extraordinary circumstances. Even though I allow you to submit the lab (for a 50% penalty) up to two days late, I really want to discourage such late submissions because I would like to post solutions to a lab right after it has been due.
  
• Example:  Suppose Lab 1 is due on January 1 by 9 a.m. You contact me on January 1 at 8:30 a.m. and ask for a (regular) extension, which I will normally grant. If you then submit your lab on January 1 at 11:45 p.m., you receive 80%. If you submit it on January 2nd or on January 3 before 9 a.m., you receive 50%. If you submit it after 9 a.m. of January 3rd, you receive a 0. You will also receive a 0 if you have not asked for an extension before 9 a.m. on January 1 or, as the last resort, imediately after class on that day.  An extraordinary extension (i.e., without a penalty or for longer than two days) may be granted, but it still must be requested in the timeframe described above.
  
• 3)  The subject line of your e-mail must contain the string  math_121  (it may contain anything else in addition to that).  Note the underscore and its placement:   math_121,  NOT  math121, or math 121, or math121_ !
  
• 4)  All your other e-mails (with questions etc.) must NOT contain that string; otherwise I cannot guarantee a timely response.  
  
• 5)  The name of the file that you submit must follow the format:    math121_lab#_YOURNAME.nb  or  math121_lab#part#_YOURNAME(s) .nb  ("yourname" does not have to be in capitals).