## Math for my Mom – Birthday Edition

Earlier on this month my dad turned 50, and my brother and I drove down to his house in rural Saskatchewan to surprise him. He was so surprised and happy that he started crying. It was very sweet. My dad is a very sweet guy in general. He lives close to my Baba (grandmother) and makes his living doing odd jobs around the town.

Now my dad is no mathematician, but he observed a cool thing with birthdays and his siblings. First, my dad (born in 1962) has 4 siblings: Zandy (1956), Pat (1951), Phillip (1949) and Perry (1953). In 2011, when he turned 49, his brother Phillip turned 62.  I.e. they each were as old as the other’s year of birth (well not counting the 1900 part). Even more, in 2013, when my dad turns 51, his sister Pat turns 62. This will continue on when he turns 53 (Perry will be 62) and 56 (Perry will turn 62). Neat!

## Stevo’s Forcing Class Fall 2012 – Class 12

(This is the twelfth lecture in Stevo Todorcevic’s Forcing class, held in the fall of 2012. You can find the eleventh lecture here. Quotes by Stevo are in dark blue; some are deep, some are funny, some are paraphrased so use your judgement. As always I appreciate any type of feedback, including reporting typos, in the comments below.)

## Stevo’s Forcing Class Fall 2012 – Class 13

(This is the thirteenth lecture in Stevo Todorcevic’s Forcing class, held in the fall of 2012. You can find the twelfth lecture here. Quotes by Stevo are in dark blue; some are deep, some are funny, some are paraphrased so use your judgement. As always I appreciate any type of feedback, including reporting typos, in the comments below.)

## Stevo’s Forcing Class Fall 2012 – Class 11

(This is the eleventh lecture in Stevo Todorcevic’s Forcing class, held in the fall of 2012. You can find the tenth lecture here. Quotes by Stevo are in dark blue; some are deep, some are funny, some are paraphrased so use your judgement. As always I appreciate any type of feedback, including reporting typos, in the comments below.)

## Stevo’s Forcing Class Fall 2012 – Class 10

(This is the tenth lecture in Stevo Todorcevic’s Forcing class, held in the fall of 2012. You can find the ninth lecture here. Quotes by Stevo are in dark blue; some are deep, some are funny, some are paraphrased so use your judgement. As always I appreciate any type of feedback, including reporting typos, in the comments below. I am sure that this one has a ton of typos. There are also some omissions which I will try to patch up.)