So, i was wondering we all know that master yi does really heavy damage, and people always say Jax beats all AA champs. But, wouldnt master yi be able to kill jax if they were both full build and yi had 
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and if he dodged Jax's stun? I also know for a fact nasus cant beat yi cause wither doesnt affect him only way is 
you can easily outplay jax stun with your Q
For nasus if nasus dosent have 1300 stacks yi win easily and thormail is useless because with all that item yi would deal for 6 seconds 200 true damage per hit...and with the lvl 16 ulti and PD and BTRK he would have 2.2 AS meaning 2 attacks per seconds so you do the math!!
yi can 1v1 anyone lategame, exept hard cc+burst that 100-0 him in one go, but banshies helps alot for that. He just needs to be a bit smarter than just rightclicking vs some(sadaly, vs most champs it is enough to press E+R and rightclick), like useing the massive ms to kite jax duering his E or tryn duering ult, time the alphastrike right to dodge stuff and mostly know then to block burst with meditate.
Wither is an attack speed slow, and also it is dependent on how many stacks Nasus has. Not to mention the conditions of the match, if it's a 1v1 or a teamfight, because in a 1v1 he can just stack 400 armor and 5000 health and Q him to death.
Nasus does enough damage on a farmed Q that I don't know if Yi could kill a tank Nasus quickly enough. It probably depends on the interaction between Highlander and Wither. Does Highlander prevent the attackspeed slow or just the movespeed slow? Also, with his ult, Nasus might just be too tanky regardless.
Jax just has to play smarter than Yi. Bait the Alpha Strike with E, then Q to him (if needed) and activate the stun, or if he waits to dodge the stun, you can just use it immediately. Jax has an advantage, because Yi doesn't know when the stun will go off.
Yi can easily take both of them assuming the Yi player isn't stupid
Run away when Jax has his stun up
Yi will just straight up kill Nasus before he can get a Second Q off, but in some strange fluke of events Nasus actually does not die in 2.4 seconds, just meditate the second Q. Even if you don't meditate, I'm pretty sure it won't kill him.
Depends on what the Nasus/Jax built.
If they have , Jax can outplay with his dodge, and Nasus can burst him down. This is dependant on the fact that Master Yi can't use his Q to dodge either, which a smart one won't bother wasting it just to engage.
If he's teamed up on, there's no way he's going to win a fight against either.
there is no nasus build that can beat a well built yi
there is no yi build that can beat a well built jax - consider that you have a 2.8 second window at best to deal damage to a jax who has max cdr
Jax 3shots Yi, while Yi does no dmg to him. Ap Jax can 1shot Yi with any ability and Lichbane proc. Good Nasus players get CDR and crit chance in runes, so Nasus can also 1 shot Yi, if he gets a lucky/Triforce crit. All the power of Yi is in the Q crit... many champions can manfight him, if he doesn't take their whole hp with 1 Q crit and 1 autoattack/passive crit after that. Fiora can burst him faster, Trynda can 2 shot Yi while being immune to death. All the assasins can 1shot Yi, hypercarries 1 or 2 shot him from a long range. He functions like AD version of Kata - you wipe one with your Q and get resets to clean the teamfight, but his 1v1 potential is really overrated.
AP Jax would instagib Yi full build. Normal triforce/botrk build depends on who catches who I feel.
How many stacks does nasus have? Enough Stacks and Nasus wins, lower stacks and Yi wins.
Nasus wins with a Bloodthirster.
Wither doesn't affect Yi's MS, however it does affect his AS.
