Basically the seller can take whatever they want out of the house including a Viking stove, a high end refrigerator, curtain rods, curtains, chandeliers, washer/dryer, etc. However, anything they are NOT including in the sale should be disclosed in the listing, and if they are being replaced that should be disclosed as well.
I recently sold a home where the dining room chandelier was a family heirloom, and the seller replaced it prior to closing, but this information was disclosed in the listing agreement AND in the MLS listing as well. I had another where the seller just paid $2000 for a refrigerator and took it with them. They sold the house but disclosed that it was not part of the sale AND they were not replacing it with another one.
Usually no one take the stove, but it can happen. I know it's frustrating to look at a home with all the fancy appliances, lovely curtains/blinds , ceiling fans etc only to find out they aren't included in the sale. Your agent should verify all included items, and mention them specifically in the contract of sale so there is no confusion.